I can post on Facebook that I disagree with president Trump and he is a liar, try doing the same in China. (Please don't take my comment as a suggestion about President Trump, just trying to make a point).
They were surprised you could do that...
There is even an old soviet joke about this.
An American tells a Russian that the United States is so free he can stand in front of the White House and yell, “To hell with Ronald Reagan.” The Russian replies, “That’s nothing. I can stand in front of the Kremlin and yell, ‘To hell with Ronald Reagan,’ too.”
Also, we are allowed to post photos with breasts (and much more) on our social network Vkontakte.
Now try to acquire a popular social media app in USA.