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Social network analysis has attracted intensive interests by researchers from multiple disciplines. However most of the existing work is descriptive nature, and statistical network analysis remains an active area of research. In this paper, we model and study two facets of the social networks in short message services (SMS). One is the structure of the contact networks of mobile users, the other is users' messaging behavior pattern. We want to account for the heterogeneity in behavior so thatdblp:conf/icis/ZhangMK11 fatcat:27dsvb3qzraxtl3z3dxxz6fkjy