if u are asking about something like facebook,then it should be renren.com , kaixin001 or douban.renren and kaixin001 are total rip-off from facebook.douban is more based on individual users' interests in books, films, music and stuff.

definitely QQ!!!In China, more than one hundred million people use it .

we always use http://www.tudou.com/to see videos then we use QQ to keep in touch with our friens, it just like MSN or MY Space.then we always use Baidu to search resources.maybe there are more popular websits in China.

It is QQ.But the people in Taiwan is use MSN.

A lot..QQ is the most widely used messenger. They also have renren, kaixin. They got their own blogs and twitter.