Not extremely serious yet, but they are quickly cracking down on it. For example in some cases you can't even criticize politicians anymore. People were banned for that, or even fined by the government.

And there were many more shenanigans. It's still somewhat free, but only on mainstream issues, and they will crack down on that too.

I suppose by 2020, the traditional social media, will become a totally controlled, North Korean style propaganda system.

Until then we have to grow the alternatives.