Apparently it is much harder to make an account from China.
We should start by adding a few of the sites in this article as login options. This will help increase the user base.
Douban is a message posting site like MySpace with 100m users, according to the article. link here
Tencent chat QQ is a large mobile phone chatting service with 784m active users. According to Wikipedia
Tencent QQ, popularly known as QQ, is an instant messaging software service developed by a Chinese company named Tencent Holdings Limited. QQ also offers a variety of services, including online social games, music, shopping, microblogging, movies, and group and voice chat. The logo and mascot is a small penguin wearing a red scarf.
Renren is China's Facebook. We need to let people login with Renren. It has 625m users according to this article