When other things have such powerful network effects we force them, through the state, to treat people fairly. For instance, utilities like water and electricity are natural monopolies because of the limited physical space for the infrastructure. Social networks aren't quite the same but there are powerful similarities.
The key difference is the penalty: is it going to jail or some people roll their eyes and stop being your friend?
I don't think it's ever going to be "people enthusiastically try to understand your positions and respect them". That has been the ideal in the US, but historically I can't find the pages in a history book where it's been largely true.
If you talk about a Free Tibet in China, you risk having your legs broken and your family put in camps.
If you violate Facebook's ToS, you might get banned from their website. Then you can just type literally any other website into your address bar and be on your way.
In a lot of ways, Facebook is as much of a country as the Vatican is.