Before you make any statements about his this could potentially suppress voices and opinions, you can always make your own site. Even if the government did not interfere with these sites, the sites themselves totally have the right to regulate everything that's being posted. This is only to encourage this because companies like facebook didn't seem to give much of a damn about regulation.
Social media allows you to use a pseudonym which makes it possible to share an opinion (and thus, to a tiny extend, shape society) without the people who know you in "real life" learning about it. If you have a personal website you have, by German law, to publish your name and address on this website. As a result, people can google what you write.
So if you want to discuss an opinion that people you interact with in real life don't accept you have to accept that they could find your posts. This, naturally, could have a chilling effect leading to you not writing about issues you care about.