This section (Chapters 9–14) includes chapters that analyze networks created by a particular social media platform. The chapters need not be read in order, but they do assume you are familiar with social media and social network analysis fundamentals (Part I) and NodeXL (Part II). Each chapter in this section discusses how to extract network data, what questions can be addressed, and how to analyze and visualize the networks to reach actionable insights. Specific chapters focus on email (Chapter 9), threaded conversation (Chapter 10), Twitter (Chapter 11), Facebook (Chapter 12), YouTube (Chapter 13), and wikis (Chapter 14).