From Forbes.com:
Despite the extent of Internet censorship, gaps remain:
–A recent study found the system is less effective when more people are online, enabling banned terms to slip through.
–Other studies have reported the erratic nature of censorship–for example, at certain times, users in particular locations are able to browse the Internet with few restrictions.
–Costs and logistical difficulties also have limited the system–the government this year was forced to abandon a plan to mandate registration of individual users on blogs because of the complexity and likely failure of enforcing registration among China’s 20 million bloggers. [Full Text]