Comment A view from inside China (Score 5, Interesting) 235
I am actually currently in China. Sites which are carte-blance blocked include: Facebook, youtube, wikipedia, blogger.com (as a side note: Wikipedia really is useful--reminded of that now that it is not available).
The reason for blocking Facebook and company is because they are starting to work for serious political change: see today's 'No Prorouge' rallies occurring today in Canada [and at worldwide Canadian embassies] after the Canadian prime minister leader cancelled the democratically-elected parliament for weeks--these rallies are a result of over 200,000 strong grassroots Facebook group support. Concurrent to that is an evaporation of that prime ministers lead in the polls versus the opposition party.