title: Empirical Studies on the Network of Social Groups: The Case of Tencent QQ.
abstract: BACKGROUND
  Participation in social groups are important but the collective behaviors of human as a group are difficult to analyze due to the difficulties to quantify ordinary social relation, group membership, and to collect a comprehensive dataset. Such difficulties can be circumvented by analyzing online social networks.
  
  
  RESULTS
  In this paper, we analyze a comprehensive dataset released from Tencent QQ, an instant messenger with the highest market share in China. Specifically, we analyze three derivative networks involving groups and their members-the hypergraph of groups, the network of groups and the user network-to reveal social interactions at microscopic and mesoscopic level.
  
  
  CONCLUSIONS
  Our results uncover interesting behaviors on the growth of user groups, the interactions between groups, and their relationship with member age and gender. These findings lead to insights which are difficult to obtain in social networks based on personal contacts.
authors.affiliation: Alibaba Research Center for Complexity Sciences, Hangzhou Normal University, Hangzhou 311121, China.
authors.forename: Zhi-Qiang
authors.initials: ZQ
authors.lastname: You
authors.affiliation: Alibaba Research Center for Complexity Sciences, Hangzhou Normal University, Hangzhou 311121, China.
authors.forename: Xiao-Pu
authors.initials: XP
authors.lastname: Han
authors.affiliation: Alibaba Research Center for Complexity Sciences, Hangzhou Normal University, Hangzhou 311121, China.
authors.forename: Linyuan
authors.initials: L
authors.lastname: Lü
authors.affiliation: Department of Science and Environmental Studies, The Hong Kong Institute of Education, Hong Kong.
authors.forename: Chi Ho
authors.initials: CH
authors.lastname: Yeung
mesh_terms: D000367:Age Factors; D003196:Computer Graphics; D016208:Databases, Factual; D005260:Female; D006801:Humans; D020407:Internet; D007398:Interpersonal Relations; D008297:Male; D012919:Social Behavior; D060756:Social Networking; D055815:Young Adult