There are so many sites, it's too long to list Facebook is not the only social networking site to be banned, although they have their kaixin001 over there. Myspace, twitter, tumblr, and foursquare are all blocked. Video sites like youtube, metacafe, or dailymotion are blocked. Obviously any falungong websites are going to be blocked. Also note that even on search engines, a lot of stuff is censored. Searching certain subjects on search engines like Tienman Square or Dahli Lama, whether it's web search or image search, will yield very different results in China (on Wikipedia, they'll just be blocked). All this can be bypassed through the use of proxy servers in foreign countries, but the practice is not legal.

oh, I'm interested in the question, too. As a local person, I have never ever seen the website like facebook~ What a pity~