about internet Censorship, there is no greater topic than China. China uses numerous methods to block internet access, such as IP blocking, DNS filtering, URL filtering, Deep Packet Inspection and Packet Filtering. If you attempt to access a blocked site to many times, your internet can be shut down for up to 30 minutes. I minor inconvenience at first, but it is very effective, If you’d like to see if your webpage is blocked in china, visit http://www.greatfirewallofchina.org/