For example, I know that blogspot is banned. What else are banned? Is wordpress banned there? How about facebook?
wordpress, blogger(blogpost), tumblr are also banned
The system of firewall of China is called the GFW. Google it!
famous websites like Twitter, Facebook, part of Google's services, Youtube, also thousand of blogs.
And what happens if you , say , sneak your way into those websites using Probably Repudiatable Online eXtrication sYstems (if you catch my drift) ?