I think the discussion goes to is fb a publisher that can be held responsible for what is posted or is fb just a platform? I didn't follow along too closely but there was a section 230(?) that people were talking about that protects platforms and not publishers. Someone more interested in that topic would have to explain.
Section 230 from Wiki: Section 230(c)(2) provides immunity from civil liabilities for information service providers that remove or restrict content from their services they deem "obscene, lewd, lascivious, filthy, excessively violent, harassing, or otherwise objectionable, whether or not such material is constitutionally protected", as long as they act "in good faith" in this action.
I just think it's the nature of the beast here. SM platforms can censor what they want. An SM platform is essentially a forum.