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Along with the rapid development of the Internet technology and its application , especially the emergence of SNS website, interpersonal communication on the network has taken on a new and different form, shown a lot of new features. So we can no longer stay in the traditional interpersonal communication theory,whereas we should constantly update the theory,making it syncronize with the innovation of the media's technology. deeply exploring the interpersonal communication network and the new features and possible future development trends in the Internet age. This paper starting from the concept of SNS, with RenRen network as an example, analyzes the spread of SNS websites' characteristics and communication effect, and details in the analysis of the cause of the popular web site SNS.