You're right. The root of this problem isn't Facebook. It's the fact that private media companies are in control of what should be a peer to peer conversation between people.

There is no way to fix social media. If we moderate it too much, it's "censorship." If we don't then the engagement algorithms will drive mass indoctrination into crazy ideologies that have high virality. If we do try to eliminate disinformation, who decides what is and is not correct? There's no solution to these problems because media -- mediation -- is the problem.