In the recent two decades, the Internet has become more and more important in people’s lives, not only on working side, but also in people’ daily lives. And with the development of the Internet, from 1.0 to web 2.0 , people’s lives and the ways of communication are changed. This paper is going to analysis how the web 2.0 bring in the social network site and what is the social network site we are using every day. Also the paper will highlight how the social network sites impact people’s lives by introduce the Chinese Facebook-Renren and compare Chinese instant message system QQ with Renren. Finally, the paper will have a little touch of how the social network site influence the business and organization works.
