The Government Uses IP Blocking to Silence Websites
When a website is deemed inappropriate by the government, its IP address is blocked by the Golden Shield Project. Service providers receive a list of websites that should be blocked and prevent them from connecting to the computers attempting to access them. Such websites include those that feature any information about Tianamen Square, the Dalai Lama, and any protests. The government also requires social networks like Facebook, YouTube, and Twitter to block any controversial content. This was most recently seen in 2009 when those protesting in Xinjiang attempted to use Facebook to organize and saw their efforts completely impeded.