CHAPTER 5

Data Mining and Analytics

Mary loves the lines of the song, “Every breath you take. Every move you make … I’ll be watching you. Every single day. Every word you say.” Companies may well be singing that song today, as they track Mary every single moment of her life. Using techniques of data analytics, they know more about her than even her parents.

In the movie Minority Review, as the hero walks into a clothing store, his eye is scanned by a computer and he is immediately greeted by name. The computer also accesses his purchase history to make suggestions and reminds him of the products that he might need.

This is indeed what shopping is evolving into, thanks to a world in which we leave data in everything that we do online. By analyzing this data, companies know quite a bit about us, including our buying habits. Data mining and analytics gives power to companies to identify us and to make product offers to us, just like in the movie.

True, companies have always looked for data about their ­customers. They want to know who they are, where they live, and analyze their profiles to precisely meet their needs. But getting data about consumer behavior has not been easy. The traditional method consists of arming researchers with questionnaires and getting them filled through surveys or focus groups. This is not a very accurate or dependable method, since consumers do not like to be questioned about their decisions or give their personal data. Worse, they are often not aware of their own motivations for buying things. Brown (2001) summed up the frustration of getting customer data, “Consumers don’t know what they want. They never have. They never will. The wretches don’t even know what they don’t want.”

Indeed, Henry Ford’s famous remark, “If I had asked my ­customers what they wanted, they would have said a faster horse,” shows that ­consumers operate from existing mindsets and seldom see things from a more innovative angle.

Companies have looked for better ways to track their customers. Now they have that tool: a data deluge that yields almost everything about a consumer through data mining and analytics.


Data Deluge

Called big data, it is a powerful tool to know not only about the consumers but also about their behavior and state of mind. It consists of the huge volumes of data that are being created at various points in the global economy, such as:

  1. Transactional data, consisting of transactions made by customers, suppliers, and others every day;
  2. Data from a growing number of networked sensors in mobile phones, smart energy meters, automobiles, and industrial machines;
  3. Data exhaust, consisting of trails of data that people leave behind as they browse, communicate, buy, or search online;
  4. Data generated by cookies on people’s computers, which collect and send information about the online activities of people. Computers and social media sites enable companies to collect information about their online activities;
  5. Data tracked by cell phone usage and apps on phones, which gives information about consumers’ precise habits and locations;
  6. Information that consumers willingly share on social media sites, including comments, reviews, pictures, and videos, and ego broadcasting;
  7. Enterprise Application Data that is available in databases of customer relationship management (CRM), Supply Chain Management, Enterprise Resource Management, or on a company’s website;
  8. Sensors in public places, video recordings from cameras in banks, railway stations, traffic lights, ATMs, and so on;
  9. Information about a person’s health and state of mind through ­wearable devices; and
  10. Public databases such as government records, telephone directories, census figures, and the like.

The result is an immense amount of data, streaming in from different sources. “Customers are telling us all about themselves, each day, every day. We now create as much information every 48 hours as we did from the dawn of civilization up to 2003,” says Mckinsey in its report, The Data Driven Life (2013).

How companies use this enormous resource depends on their vision and capabilities. Big data gives information in real time: Every device, ­shipment, and consumer is providing data on happenings as they occur. Data analytics is the process of inspecting, cleaning, transforming, and ­modeling data with the purpose of discovering patterns and drawing ­conclusions. It promises to change the way business is done.

The task is not easy because the data come from varied sources and in differing formats, structured and unstructured. Davenport (2014) explains that companies have to develop abilities to integrate internal transactional data with existing databases, comments on social media, credit and ­loyalty cards transactions, the sites that people visit, and also with automatic sensors that give information about the context of ­purchasing. All these data sets will be in different formats and a high level of expertise is needed to clean and integrate them with company databases.

Big data is indeed valuable to companies. Davenport (2006) writes, “They know what products their customers want, but they also know what prices those customers will pay, and how many items each will buy in a lifetime, and what triggers will make people buy more.” Companies can today identify their most profitable customers, increase the ­likelihood that their products will be liked, and increase customer loyalty, all through analytical methods.


Making Use of Data

The data analysis ability is not easily acquired, simply because the quantum of data available is huge. Loveman (2003) dubs it as a future diamond mine, where millions of individual transactions are available. Barton and Court (2012) explain three steps as to how companies acquire abilities to make use of this enormous data:

  1. Source data from multiple sources: Companies need systems to get data from multiple sources and consumer touch points.
  2. Build prediction and optimization models: The data must be used to build analytics models for predicting and optimizing outcomes.
  3. Change the organization: Data is not merely a resource in modern organizations, but a transformational agent. Traditional marketing structures have to change, as discussed in Chapter 4.

Data analysis involves detective work, by uncovering insights from the streaming data. The detective follows the data trails left by people as they do things.


Consumers’ Data Trails

Davenport (2013) writes that powerful data capabilities will apply not just to a company’s operations but also to its offerings—to embed data smartness into the products and services customers buy. Data analytics and ­optimization can be built into every business decision, leading to ­better customer engagement and, consequently, to higher profits. McKinsey estimates that a retailer using big data to the full has the potential to increase its operating margin by more than 60 percent. How Apple, Google, and eBay use data trails is illustrated in Exhibit 5.1.


Exhibit 5.1

Getting Personal with Data Mining

Companies are already using data mining techniques to offer ­personalized products and messages pinpointed to customers. This exhibit shows how three companies—Apple, Google, and eBay—effectively use data to understand consumer behavior.

Apple: Apple’s app network connects brands with users where they are most engaged. Its iAd service, which is built into its iOS, helps in precise targeting. Users are analyzed in terms of website preferences, internet usage behavior, apps used, a person’s music, TV and audiobook preferences, devices, demographics, and ­network. As a result, each ad is shown only to people who will see it, through the apps they like to use. Demographic data and people’s unique interests and preferences are used to connect the most relevant brands.

Google: Google collects and analyzes customer data and uses data mining techniques. Its philosophy, as explained on its website, is to focus on the user and all else will follow. Information about IP addresses, search terms, and browser types are collected, which helps the company to build a precise profile of people. Data ­provides Google with information about geographical location with a built-in weather forecast. Through its mail ­analysis, it provides further insights. Data about music and video ­preferences are collected via YouTube, and Google Maps gets information on travel destinations and plans.

eBay: The eBay stores more consumer data in its central data warehouse, which is used to get an integrated customer view to generate innovations. In-house departments use the data by building sand boxes and compare it with external data.


Data analysts follow trails left by people, picking up details of their habits and purchases. It is like following a fireworks display—the eye knows the light left behind by a bright light as it moves across the sky. ­Following this data trail in a manner of detectives—dubbed as digital breadcrumbs by Alex Pentland (2014)—can give accurate pictures of ­consumer habits. Data analytics help to link behavioral, transaction, and customer interaction insights into the minds of consumers. Pentland calls this social physics—the combination of data reveals how humans interact and how ideas spread. The millions of data points measured over a long period of time in real settings are the living laboratories that help us monitor human behavior like never before. For example, Pentland finds how behavior changes when people fall ill; using data from websites and phones, companies can tell that certain people were going to get flu even before they get it. Similarly, advanced analytics help companies to know when purchase decisions are most likely to be made. Some companies have already made strides in this capability (Exhibit 5.2).


Exhibit 5.2

Predictive Analytics

Retailers have always collected information on their customers. ­Target too does that, assigning each shopper a unique code that lets the ­company track a person’s purchase history. The company tracks all interactions—such as using a credit card, filling out a survey, calling the customer helpline, opening an e-mail, or visiting its website—to workout detailed consumer profiles. This data is linked to demographic and geographic information along with bought data about ethnicity, job history, magazines subscribed, banking information, social networking data, and so on to work out detailed product preferences. This ­information is analyzed and throughpredictive analytics the company can figure out what you want and when. Specific ­mailers are then sent to customers, and sales of the products advertised ­skyrocket as a result.

Target could link purchase of certain items like unscented lotion, health supplements, scent-free soap, and extra-big bags of cotton balls to pregnant ladies. The company could also figure out a lady’s due date.

New Scientist (Rutkin 2014) reports an algorithm can track flu cases across the United States by mining data. The program is able to predict flu outbreaks in the United States by monitoring what people search for on Wikipedia. The program downloads publicly available information every hour about how many people across the country accessed the pages. By doing so, they could accurately predict the number of cases in the country two weeks earlier and with a difference of just 0.27 percent.


Google Analytics helps website owners to know important facts about visitors. Users can set up their own dashboards and track which online campaigns bring the most traffic and conversions, where the visitors are located, and find out what people are searching for and see what they click on. Google Analytics is a virtual powerhouse to understand website traffic and to identify users.

This is not all. Researchers say they can pinpoint personality traits by merely studying user-generated text such as e-mails and social media posts. Eben Haber and his team at IBM has developed software that ­studies streams of tweets from social media and correlates them to ­personality, values, and needs. The software can map someone’s personality from just about 200 tweets, which helps predict their purchases. Extroverts, for instance, are attracted to advertisements that offer excitement by buying a mobile phone. They also prefer Coca-Cola to Pepsi and Maybelline ­cosmetics to Max Factor. Pepsi, on the other hand, is preferred by agreeable people.

Technologies are being refined all the time to get deeper insights. Whereas earlier, computers could only look at quantitative data, now all kinds of data are analyzed.

The Economist (2014) reports of face-recognition technologies which can extract information about people by tracking the images available online. The Elastic Bunch Graph Matching technique (EBGM), creates a 3D model from two-dimensional images, which can be used to match with any other images. The technology is used to go over video feeds from the growing number of cameras from restaurants, streets, traffic lights, offices, and other sources. “We may not be far from a world in which your movements could be tracked all the time, where a stranger walking down the street can immediately identify exactly who you are,” says another report in The Economist (2013a).

Another technology is IBM Watson. It helps companies track the natural language that is being posted all the time, as shown in Exhibit 5.3. This represents a giant step toward analyzing the millions of comments that are posted by consumers daily.


Exhibit 5.3

IBM Watson: Big Data Analysis for Marketing

So far, computers have crunched numbers to help in marketing ­decision making. Managers and researchers must have wondered how nice it would be if a computer could go through the enormous ­natural language data produced daily—on blogs, Internet conversations on various platforms, Facebook comments, and so on—and produce intelligence about the mood and concerns of consumers. Reading and tracking all this data by humans is impossible, simply because of the size involved. Companies have no way to track what is written on each and every site globally.

IBM Watson does just that. Named after IBM founder Thomas J. Watson, it uses natural language processing and analytics, and ­processes information just the way people think. This ability represents a major advantage in an organization’s ability to analyze and respond to big data. Watson’s ability to answer complex questions posed in natural language quickly is a great boon for companies to help assess and predict consumer needs based on what they share on the Internet.

Another advantage of IBM Watson is that users can get insights through visual representations without the need for advanced analytics training, through its natural language interface. The service removes impediments in the data discovery process, enabling business users to quickly and independently uncover new insights in their data. Watson Analytics automatically prepares the data, finds the most important relationships, and presents the results in a visual format for managers.

The ability of Watson to evaluate social media data, publicly ­available data, and proprietary data from clients and continuously learn from that information is becoming invaluable in many industries. In marketing, a company could train Watson to understand its ­customers, and then use predictive models to recognize new products or services that their customers will buy. It can analyze and predict ­consumer sentiment and needs, evaluate new products, or predict which advertising will be effective. For example, it can figure out whether a movie trailer is going to positively affect an audience or not. IBM is now allowing customers to use Watson as a service and has opened it up to developers to build Watson apps.


CH005_F001_BDC_fmt

Source: Courtesy of International Business Machines Corporation, © International Business Machines Corporation. Reprinted with permission from IBM Corporation.


The natural language processing and learning ability of IBM ­Watson can:

Predict new trends and shifting tastes: Watson processes ­enormous amounts of consumer data and learns as it goes along. It does not ­forget anything: data from credit cards, sales databases, social ­networks, ­location data, web pages, and it combines all the information to make high-probability predictions and even sentiment analysis. Interestingly, Watson can recognize irony and sarcasm—and find out the intended meaning. This ­ability helps it to quickly analyze large sample sizes to determine whether a product offering or clothing line will be accepted by consumers.

Analyze social conversations and thus generate leads: Watson can ­predict what information is most important and go through reports about the industry, competitors, partners, and customers and make recommendations on how to act on it. For example, if it finds some people discussing problems, it can match those with the company’s product and notify the sales team.

Determine whether a new innovation will sell or not: Watson can learn from one domain of knowledge and make high-probability ­predictions in another, and this helps it to understand whether a new innovation will sell or not. It crunches the company’s ­current market and customer base to provide success ­probabilities, as well as provides a sharp picture of the opportunities and threats.

Computer-calculated and automated growth hacking: Growth ­hackers seek to maximize conversions on e-mails, websites, social media, online content, or other digital media. Watson does this to ­measure and optimize digital content, ads, website pages, and even a company’s product to maximize customer growth.

Measurement of ad effectiveness and media planning: Nielsen has partnered with IBM Watson to improve measurement of ad effectiveness and media planning. Its data-parsing system is used for CRM, customer call centers, and other purposes through its Watson Engagement Advisor offering. Questions like who are my best prospects in a category and how much should I budget for next year are answered by taking into account data that might be normally ignored. By identifying prospective customers, ad effectiveness will become more efficient.


Data trails are analyzed in a series of five steps. Starting with finding out what people need, it also helps to identify focused advertisements, ­tailor-made promotions, reinvents purchase experience, and finally encourages positive WOM (Figure 5.1).


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Figure 5.1 Analyzing data trails


How these are achieved is discussed in detail here.

Identifying Consumer Needs

Big data helps right from the beginning, that is, by identifying consumer needs. Predictive analytics track data from various sources to tell ­companies what people need before they know it.

The information that earlier took years to collect and analyze is available easily today. Take a look at how data trails lead to the consumer’s mind:

  • Cookies on computers and social profiles reveal the ­consumer’s income bracket, age, sex, and education.
  • The Internet address can reveal the consumer’s geographic location right up to their address. Mobile devices using GPS reveal the exact location of the customer.
  • The kind of device used reveals the consumer’s affluence: for example, Apple computer owners are likely, on average, to be better off than Windows PC users.
  • What people write or share on various websites reveals about their personality and emotional state.
  • Clicking behavior shows consumer needs: for example, someone clicking too quickly to check out means that the consumer has already decided to buy, so no discounts may be offered.

All it requires is a good detective, or a data analyst, who can make sense of these trails and combine them with data streaming in from ­various connected devices.

Focused Advertising

In advertising, companies create microfocused targeted messages that are delivered at the perfect moment, when the consumer is receptive toward receiving such ads. Data analytics help discover which ads will be most liked and should be served to individual customers.

This is a big help to companies because traditional ways of advertising do not work anymore. Mass media is fragmented today and losing its effectiveness, which is described by Bob Garfield as The Chaos ­Scenario (2009) in the book of the same name. “Newspapers, magazines and ­especially TV as we currently know them are fundamentally doomed,” he ­predicts as audience shrinks globally. Connected consumers prefer to fiddle with their connected devices rather than listen to what the media is telling them. How marketing communications can be made more relevant is discussed in Chapter 6.

Devising Offers

Just as ads can be precisely targeted, so also can products. Companies track what a consumer likes across the Internet and are able to modify their offers. Using consumer data with online tracking, nowadays ­companies are able to create customized offers that immediately attract customers. Davenport, Mule, and Lucker (2011) call these next best offers (NBOs). Based on social, mobile, and location information of customers, “companies are beginning to craft offers based on where a customer is at any given moment, what his social media posts say about his interests, and even what his friends are buying or discussing online,” they write.

New methods of understanding customers are being developed. One such method is Real-time Experience Tracking (RET), which helps ­companies to know how and which touch points influence the consumer decision journey most significantly. The method involves asking a ­consumer panel to send four-character text messages through their mobile phones when they come across a brand or a competitor during their purchase process. The short message sends the codes for brand, touch point type, positivity or the feeling of the customer, and a rating of persuasiveness. Qualitative details are captured when respondents are surveyed about their brand-attitude changes.

RET helps companies to track effectiveness of ads, track competitor stimuli, and more importantly, helps understand how consumer attitudes change over touch points during the purchase journey. The sequence of text messages of RET reveals insights that traditional surveys cannot reveal.

  • Unilever used this method to find out about the effectiveness its Axe campaign in two countries. Though its TV ­advertising in Italy and Poland was positively received, the company found the brand was not doing very well in Italy but was a huge success in Poland. Through RET, it found that in Poland, the ads followed street experiences in which an Axe Police consisting of attractive women would arrest young men and spray them with Axe. The company found that using such experiences at touch points greatly increased the ­effectiveness of advertising.
  • A charity found that the in-store experience of donors was not very good, so donations were getting affected. It decided to use a smarter layout and displayed messages about its work, and this resulted in increase in donations.
  • PepsiCo relaunched Gatorade in Mexico. By using RET, the company found that advertising and touch point experiences in gyms and parks were twice as effective as doing it in stores. Shifting ads and distribution into these touch points resulted in a successful launch.

Dialog, access, risk–benefits, and transparency are emerging as the basis for interaction between the consumer and the firm, which helps in reinventing the purchase experience for customers.

Reinventing Purchase Experience

Traditional retailers had a big advantage over today’s companies—they knew about their consumers. A person running a small store could ­recognize most customers, engage them in small talk, and make ­gentle product recommendations. Companies and retailers do not have this ­luxury today, but now big data promises to give them the same ­advantage. As customers walk into a store, their mobile phones give away their ­identity and location. If they are already using the store’s app, the ­company ­immediately knows their profiles and purchase history. This data can be used to enhance consumer experience and also to generate loyalty. Companies can now deliver convenience just like the traditional small retailer in the following ways:

  • Engage with customers as they walk in and react to their needs through real-time data;
  • Deliver personalized service and product recommendations;
  • Increase sales by helping customers at the point of purchase by frontline employees armed with tablets; and
  • Integrate physical and online activities to influence consumers at all points in their decision journeys.

The retail store then becomes much more than a place to browse and buy. It becomes an opportunity to deliver a personalized experience; the store and the online presence become one entity. Argos, a UK retailer, has a digital first strategy through which it places self-service iPads which ­customers use to browse product videos and reviews. The store provides free Wi-Fi to help customers use their own devices to check prices and products. While customers are happy to get free Wi-Fi, the store ­benefits as it gets tracking data to help in personalized promotions. Dynamic ­digital screens have replaced traditional posters and display screens. It offers a 60-s fast track service for customers who have ordered online.

Big data provides an indispensable arsenal for companies consisting of:

  • Apps: Allowing the customer to get online easily increases the possibility of consumers downloading the company’s app. The app helps the company to start a two-way ­communication with the customer. More importantly, it helps the ­collection of consumer data that can be used to track and to send ­messages or deals. Customers use apps to scan bar codes to access product information whenever they want, seek ­opinions, and order for home delivery.
  • QR codes: QR code walls are used in the store or at busy places like subways through which passers-by scan codes for ­products displayed on screen. Products thus ordered are ­delivered at home or through a click-and-collect service, depending on the preference of the customer.
  • Mobile payments: Mobile payments help customers, ­sparing them the need and hassle to carry cards or cash and to remember the codes required to authenticate payments. Apps now link bank accounts and allow consumers to pay by smartphones. Customers can also check themselves out using apps.
  • Digital signage: Digital signage displays not only product information but also QR codes and the number of likes an item has received on Facebook. Virtual reality mirrors can display images of what garments will look like on ­customers and allow them to share those images with friends over social media. Burberry stores use radio frequency ­identification device (RFID) chips embedded in clothing that help ­customers with information on mirrors in changing rooms.
  • Beacons: Stores are also employing beacons, which are small Bluetooth devices that can communicate with customer smartphones, when they are near or in the store. Beacons help to track customers and deliver offers. For example, if a customer passes a store without visiting it, a reminder or a coupon is sent that helps them pull him or her back into the store.
  • Empowering sales staff: Stores can gain perhaps the most by empowering frontline staff with tablets. They provide ­information and show products and catalogs to customers on their tablets, compare prices, take orders, help them to check out from anywhere in the shop, and so on. Restaurants help people scan menus and order on tablets even as they are waiting for a table. More important, frontline staff can access customer information by using Bluetooth devices.

Postpurchase: Encouraging WOM

WOM is one of the most important factors in purchasing decisions, ­especially for a first-time purchase. Its influence is growing with the ­digital revolution: Today every experience or comment is shared with friends. Digital WOM is read by many people, and product reviews and opinions play an important role in purchase decisions: It is no longer an intimate, one-on-one conversation, but one-to-many communication because clever reviews and comments have the tendency to go viral.

Social data analytics involves real-time tracking of what is posted on social sites. Moreover, it requires going beyond the surface and ­analyzing the context in which the comments are made: The analysis has to uncover sarcasm and statements using double meanings. This calls for ­sophisticated data and text analytics. IBM reports that such tools are available today, which are as follows:

  • BigSheets: BigSheets help to crawl the Web and analyze ­massive amounts of data on social sites.
  • Text Analytics: Refers to the process of deriving high-quality information from text. The software quickly finds information buried in unstructured text data and understands its context and content.
  • IBM Watson: Computer analysis of natural language posts (see Exhibit)
  • Semantic enrichment: Analytics help to understand the context of human speech and thought.

Social media is the single largest source of WOM. But monitoring it and encouraging consumer engagement is tough because it spans the three dimensions: Gartner calls big social data as consisting of three Vs: high-­volume, high-velocity, and high-variety information. Social data is huge: more than a billion consumers spending about a quarter of their time on social media platforms. The speed at which the social data flows is remarkable too: It is available in real time or nearly real time. It is constantly refreshing, providing quick and accurate insights into what people are doing or liking, if only we have the means to listen. And then, there is variety. Social media provides different kinds of data such as images, videos, and text. Companies can encourage WOM through the following ways:

  • Content engagement: By tracking how users interact with content, including shares, referrals, and participation in social campaigns, companies can track trending subjects. Skillful companies can interject such trends with their own ­compelling content.
  • Fan loyalty: Companies also have the means to track how frequently fans interact with their posts and campaigns and can identify opinion leaders. Such insights can lead the way to offer exclusive programs and offers for brand advocates and increase the effectiveness of brand content.
  • Fan interests: Fan interests and interactions provide clues about consumers’ intention to purchase.
  • Social profile data: Social profile data helps in segmentation and consumer profiles give away what interests people, so as to engage them.
  • User-submitted data: User submitted data is integrated with data about their behavior and interests to run targeted ­campaigns and get people talking about them.

While data analytics is a goldmine for companies, there are some ­limitations to it as well. It is important to keep in mind what data cannot reveal as well.


What Data Cannot Reveal

Many writers explain that big data analysis is a paradigm shift and enables companies to move away from gut feelings and toward data-driven ­decision making. While this may be true, can the human element in ­marketing be truly ignored?

Lee and Sobol (2012) write that human behavior is nuanced and ­complex, and data can provide only part of the story. Desire and ­motivation are influenced by a number of factors that have to be understood in context and conversation. “Data can reveal new patterns that point a firm in the right direction, but it can’t indicate what to do once there. It reveals what people do, but not why they do it,” they write.

For instance, if you notice a person with an eye movement, you can probably make out whether it was a wink or a twitch. But data cannot. When customer intelligence is applied to consumer behavior, companies are likely to find that knowing about someone is not the same as knowing them. Customer data can be used to strengthen customer ­relationships, but those actions have to build values and trust. Enamored with the predictive power of data, we often lose out on how to deal with ­people. Systems generate e-mails, SMS, and telephone calls to customers by millions, which are merely seen as intrusion in personal lives. Sending a birthday greeting to a customer might seem good CRM by a company, but for a customer getting such a message from a nameless and faceless company may mean nothing at all.

Secondly, many companies do not have access to big data ­analytics. Meer (2014) writes that small companies, companies in emerging ­markets, and business-to-business (B2B) industries operate in data-sparse ­situations. Such companies have to adopt a series of little data techniques to develop solutions for their needs.

A word of caution is given by Ross, Beath, and Quaadgras (2013). They warn about the hype surrounding big data which has made companies expect more than they can. Very often managers can gain insights merely by observing people. Moreover, using data analytics requires huge changes in business models and organizations that companies are either incapable or reluctant to do.

In the ultimate analysis, data analysis cannot substitute for common sense and observation. Companies also have to learn to use little data as well, which requires three things, writes Meer:

  • Orientation fact-based decision making: Companies have to adopt fact-based decision making, which is the basis of competitive advantage.
  • Learn by doing: Many business decisions are taken by trial and error. When little data starts yielding results, it can inspire people to learn by doing.
  • Using creativity: Then there is creativity. Marketing is a creative task, in which consumers like to be surprised and delighted. It is doubtful that merely relying on data analytics can encourage the managers to approach their jobs creatively.

In the next chapter, we discover the marketing communications that affect modern consumers like Mary. Data techniques, farming social media information, help to create targeted communications which ­people do not block out.


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