Facebook competitor is from Shenzhen? Believe it or not?

Qzone - 552 million users

A massive social network that dominates China and South Korea, Qzone is sort of a cross between Facebook and Myspace. Users are encouraged to keep both diaries and blogs, share photos and listen to music, and as such, attracts mostly 18- to 24-year-olds. Qzone is owned by  Shenzhen-based Internet portal Tencent, which also operates China's extremely popular instant-messaging service QQ.

The synergy of the social media platforms no doubt aids Qzone's popularity, but of course, it also helps that Facebook, Google, YouTube and Twitter are among the 2,600 websites blocked in mainland China. (As we noted earlier, however, Twitter's most active users are reportedly in China, subverting government filters by using proxy servers. So if people in China really did want to use Facebook, it seems they'd find a way.)