505 million: Chinese Internet user base. This amounts to 37.7% internet penetration

Renren Better known as China's Facebook, this social networking site was founded by Wang Xing, Wang Huiwen and Lai Binqiang in 2005 Market Cap: $2.11billion

Baidu A Google clone. Established in 2000 by Robin Li and Eric Xu, it's China's No. 1 search engine. Founder Robin Li is said to be the richest man in China Market Cap: $48billion

Sina Weibo, China's answer to Twitter set up by Charles Chao, who sensed an opportunity after Beijing shut down non-China based microblogging sites in 2009 Market Cap: $4.2billion

Alibaba Founded by Jack Ma, Alibaba is one of China's largest Internet groups. Its businesses: alibaba. com, etao, Tmall, TaoBao, Alipay and China Yahoo! Market Cap:$40billion

Youku Translated into 'excellent' or 'cool', this Youtube clone founded by Victor Koo in 2006. It is China's No. 1 Internet video company Market Cap: $2.41billion

Tencent Founded by Ma Huateng and Zhang Zhidong in 1998, it owns China's biggest portal. Tencent, Alibaba and Baidu together constitute the TAB triumvirate Market Cap: $44billion