Few years ago I spent time on Omegle. I got to speak with Chinese guys. Their first question was often about how we liked China (maybe invested in national pride, or worried).

I love most asian things so I could gladly list much many things I liked from China. Even after that happy introduction, the discussion went into "you know China is not all good" then listing a few problems. So far nothing surprising. But then a weird silence occured and all of a sudden, the other user started to nervously type "nono, forget it, I said nothing; oh my god .." * user disconnected *

that's what real lack of freedom of speech is.