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A large number of studies have been devoted to modeling the contents and interactions between users on Twitter. In this paper, we propose a method inspired from Social Role Theory (SRT), which assumes that a user behaves differently in different roles in the generation process of Twitter content. We consider the two most distinctive social roles on Twitter: originator and propagator, who respectively posts original messages and retweets or forwards the messages from others. In addition, we alsodoi:10.1145/2505515.2505599 dblp:conf/cikm/ZhaoWHNL13 fatcat:zg4wxv4tkzfhrbbzaerban3jle