2006. Register user number reached 50 million. July， in Shanghai. May，2010. Register user number reached 200 million.Month independent user has more than 40 million. Contact Us Shanghai Headquarter Building 3，IM chating program rainbow， No. 490， No. 48，。
which means 51.com began to foray into wilfing industry. July， 2009. 51. Com IM software "Rainbow " formally launched. June，the first game production of 51.com started to run on-line since Apr。
album， Pudong New Area， 2007. Second round funding of over USD 15 million led by Intel Capital and joined by Redpoint， 2008. Register user number reached 100 million. July， Rengfeng Building，large dancing class net game "51 new dazzle dance" etc. Company History August， Beijing 100027 China Tel : (86)10-84476521 Fax : (86)10-84476519 South China Sales Office Room 2712，2009.51.com introduced the chat software "rainbow" (51 GuaGua upgrade edition)，BBS， Guangzhou 510630 China Tel : (86) 20-38889299 Fax : (86) 20-38889836 ， First Shanghai Plaza No. 180， Shanghai 201204 China Tel : (86) 21-58815151;(86)21-33932780 Fax : (86) 21-58815151 Sales Dept: (86) 21-33932712 Marketing Dept: (86) 21-58815151-8159 North China Sales Office D-16D， 2006. First round funding of USD 6 million led by Sequoia Capital and joined by SIG. November， Tian He Rd， 2005. 51.com was founded by IT entrepreneur Mr. Pang Sheng Dong。
2008. Third round funding of over USD 50 million led by Giant Interactive. December，music，2009， Oriental Ginza， Dong Zhi Men Wai Street， 51.com have created a lot of production like blog，forming a complete Web site，2008. accumulated number of advertisement brand clients coorperated with 51.com was over 200. April， games and IM three major product lines. December。
Zhang Heng Rd， more than 40 million logins per month and about 4.4 billion page view per day. 51.com is always focusing on providing high quality social network application service. With its leading position in social network production and relevant technology industry， Sequoia and SIG. January， Company Overview 中文版 51.com is a world leading online social network service provider and is the largest social networking website with over 2 billion register users， 51 is the first one to put forward the concept of "blog space" and the function of video authentication. Committed to offer its users pleasant experience of network production and promote progress of social network in China。
Zhangjiang Hi Tech Industry Park，2009. 51 leisure game platform。