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Based on the Alexa.com site ranking system, this paper study on Facebook and Renren network ,finding the gap between China and the U.S. social network website. By comparing, we can see a big gap between Facebook and Renren network: firstly, Facebook users diversify the sources, while Renren network users have a single source. Secondly, Facebook and Renren network users, who are mainly young people, but Renren network users focused on 18-34 years old, while Facebook have more widely user groups than Renren. Thirdly, Facebook users is similar to men-to-women ratio, and Renren users are mostly women,which may be due to the two sites provided different application ,whose attractiveness is different between men and women.