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Privacy in Social Networks by Lise Getoor, Evimaria Terzi, Elena Zheleva

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CHAPTER 2

A Model for Online Social Networks

In the context of this book, when we refer to social networks, we generally mean online social networks. This includes online sites such as Facebook, Twitter, LinkedIn, Google+, and Flickr, where individuals can create user accounts and link to, or “friend,” each other, and which allow rich interactions such as joining communities or groups of interest, or participating in discussion forums. These sites often include services which allow users to build online profiles and share their preferences and opinions about items, such as tagging articles and postings, commenting on photos, and rating movies, books, or music.

Figure 2.1 shows a hypothetical user profile on the online social network Facebook. ...

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