The Social Network Sites have dramatically changed the ways people connect each other by which people create and maintain their social relations on the Web. This paper focuses on three sections including definition of SNS，experiences of SNSs and applications of SNSs. Firstly this paper gives the definition of SNSs with 3 features: public or semi-public profile; a list of friends and share of those lists. Secondly it reviews the development of SNSs all over the world，demonstrated the different characteristics in different phases. Thirdly it discusses an array of applications of SNS. At last this paper points out the research subjects and areas focusing this topic which are open for future research opportunity.
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