My favourite social media tool is RenRen which is very famous in China.

because the limitation of chinese policy, chinese inter users can not use the Facebook anytime. so that is makes RenRen goes popular which actually have a very similar functions compared with Facebook.
the original of RenRen is aim to find your schoolmates on the internet so this platform actually win a lot of young users who are the majority part of chinese internet users.

Of course you can do what you want in RenRen, publishing your current feeling, sharing photos music or anyone’s weblogs, or just chatting or playing with your friends. RenRen actually build a widely platform to make each other closer. and obviously RenRen is a suitable choice for the chinese internet users. like me.
here is RenRen’s homepage: RenRen