[thyrix]

I don't know how GFW work exactly, but I think it's not blocking based on content, which means to check every page. What China gov want to do is just prevent those naive people from being deceived by some vicious foreigners, and they don't really care about normal college students or programmers(we don't care about politics too). Indeed, en.wikipedia is unblocked at all, and we can get all academic resource(including history, most universities bought them). So if you know English, you can get everything about, e.g., 64 event. Even the gov is more anxious about contemporary politics, clever guys can get some information by just refer a politician as "big tiger".

So, 1. Chinese gov don't care about those who just want to paste a photo on twitter, they blocked website such as twitter because it's known by even some Chinese farmers or workers. They are supposed to be susceptible, which means, danger.

2. It is said that China will block by whitelist instead of blacklist(maybe like North Korea), but they didn't do that.

3. Usually, someone who can buy and setup a server for himself is clever enough to distinguish between lie by terrorists and the truth.