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China in our country as well as access to many sites have been placed on the barrier.
but I have seen in China as far as facebook, twitter, blogger blocked almost all the popular sites, such as.
these sites and categories according to their detention status as follows;

• completely blocked access to sites of red,
• yellow color to the site, albeit in part can be entered,
• The non-blocking color green sites.

As of 3 March 2010 access blocked popular sites by category as follows

Blocked access to social networking sites and communication
facebook , twitter , blogger , Tumblr , WordPress (hosted blogs) , TypePad (hosted blogs) , FriendFeed , Posterous , Technorati

Blocked access to photos and video sites
YouTube , vimeo , dailymotion , twitpic , imageshack , google picasa , ustream , blip.tv
partially blocked iTunes Store

blocked access to news and information sites
Mixx , WikiLeaks
partially blocked bbc news , wikipedia

blocked access to the tools and sharing sites
Scribd , Bit.ly , Ping.fm , Xmarks , YouSendIt , The Pirate Bay , HootSuite , MediaFire , Seesmic
partially blocked Google Apps , Google Search , Google Code , Chrome Extensions

As you can see google, facebook, twitter, blogger, wikipedia, bbc news popular sites, such as access to all blocked by China.
To get more information on this issue and to comment whatblocked ‘u can visit.