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Chapter 5 Network Structure Unlike the Web, which is largely organized around content, online social networks are organized around users. Participating users join a network, publish their profile and any content, and create links to any other users with whom they associate. The resulting social network provides a basis for maintaining social relationships, for finding users with similar interests, and for locating content and knowledge that has been contributed or endorsed by other users. An in-depth understanding of the graph structure of online social networks is necessary to evaluate current systems, to design future online social network based systems, and to understand the impact of online social networks on the Internet. For example, understanding the structure of online social networks might lead to algorithms that can detect trusted or influential users, much like the study of the Web graph led to the discovery of algorithms for finding authoritative sources in the Web [74]. Moreover, recent work has proposed the use of social networks to mitigate email spam [57], to improve Internet search [104], and to defend against Sybil attacks [169]. However, these systems have not yet been evaluated on real social networks at scale, and little is known to date on how to synthesize realistic social network graphs. 77PDF Image | Online Social Networks: Measurement, Analysis, and Applications to Distributed Information Systems
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