Internet censorship in the People’s Republic of China is conducted under a wide variety of laws and administrative regulations. . .
The escalation of the government’s effort to neutralize critical online opinion comes after a series of large anti-Japanese, anti-pollution and anti-corruption protests, many of which were organised or publicised using instant messaging services, chatrooms and text messages. . . Critical comments appearing on Internet forums, bulletin boards, blogs, vlogs or any major portals such as Sohu and Sina are usually erased within minutes.
It can happen here. Dissent can be silenced. Critical thought can disappear. Blogs can be deleted.
— Michael Norton