Illusion of Free Speech

From the study:

Contrary to previous understandings, posts with negative, even vitriolic, criticism of the state, its leaders, and its policies are not more likely to be censored. Instead, we show that the censorship program is aimed at curtailing collective action by silencing comments that represent, reinforce, or spur social mobilization, regardless of content. Censorship is oriented toward attempting to forestall collective activities that are occurring now or may occur in the future . . .

So, as it turns out they give the illusion of free speech by allowing criticism of the state. That part is similar to North America where I live. The second part is more subtle, but does ring a bell.