3Howard Rheingold. Virtual Community: Homesteading on the Electronic Frontier[M]. Addison-Wesley,1993.
4Danah M Boyd, Nicote B Ellison. Social network sites: Definition, history, and scholarship[J]. Journal of Computer-Mediated Communication, 2008,13( 1 ) : 210-230.
5Ellison N, Steinfield C, Lampe C. The benefits of Facebook "friends": Exploring the relationship between college students' use of online social networks and social capital[J]. Journal of Computer-Mediated Communication,2007, 12(4):1143-1168.
6Lampe C, Ellison N, Steinfield C. A familiar Face (book): Profile elements as signals in an online social network[A]. Proceedings of Conference On Human Factors in Computing Systems, New York, ACM Press, 2007. 435-444.
7Kumar R, Novak J, Tomkins A. Structure and evolution of online social networks[A]. Proceedings of 12th International Conference on Knowledge Discovery in Data Minining, New York: ACM Press,2006. 611-617.
8Spertus E, Sahami M, Buyukkokten O. Evaluating similarity measures: A large-scale study in the orkut social network[A]. Proceedings of 11^th International Conference on Knowledge Discovery in Data Mining New York: ACM Press, 2005. 678-684.
9Freeman L C. Centrality in social networks: Conceptual clarification[J]. Social Networks, 1979,1:215-239.