Figure B.1. BakerTweet announces fresh products to customers.

Figure B.2. Blip.fm shares your favorite music with your friends.

Figure B.3. Botanicalls plant monitoring kit.

Figure B.4. CheapTweet finds great deals and discounts.

Figure B.5. CoTweet manages contacts for business tweeting.

Figure B.6. ExecTweets aggregates messages from prominent executives.

Figure B.7. Featured Users ad network.

Figure B.8. Follow Cost finds how frequently other users tweet.

Figure B.9. Friend Or Follow shows users who aren't following their friends.

Figure B.10. Hashtags.org tracks and searches Twitter hashtags.

Figure B.11. HootSuite manages multiple Twitter accounts for multiple users.

Figure B.12. Magpie ad network.

Figure B.13. Mr. Tweet recommends users for you to follow.

Figure B.14. Remember The Milk (@rtm) to-do list.

Figure B.15. SecretTweet posts your secrets, but anonymously. Spill your guts safely!

Figure B.16. Seesmic Desktop is a Twitter Web client.

Figure B.17. SnapTweet links your photos from Flickr to Twitter.

Figure B.18. Tiny Twitter is a Twitter client for any Java-enabled phone.

Figure B.19. Tweet-a-Watt power consumption meter.

Figure B.20. TweetDeck manages Twitter, Facebook, LinkedIn, and MySpace.

Figure B.21. Tweeting Too Hard finds blowhards, so you don't have to.

Figure B.22. Tweetname looks for available domain names.

Figure B.23. TweetReach reports how frequently a phrase or URL is tweeted.

Figure B.24. TweetStats reports your own tweets.

Figure B.25. Twistori finds tweets by emotional phrases, such as "I think."

Figure B.26. TwitPic is the most popular photo-sharing site on Twitter.

Figure B.27. Twittad background advertising.

Figure B.28. Twittercal bot for Google Calendars.

Figure B.29. TwitterCounter tells the world how many followers you have.

Figure B.30. Twitterfeed pushes RSS feeds.

Figure B.31. Twitterrific is a Twitter client for Mac OS X and iPhone.

Figure B.32. WeFollow helps Twitter uses link to each other based on your tags.