I would argue the public is at a much higher risk of being tricked by giant monopolistic media organisations with very private interests than fringe lunatics. Murdoch was bad, but at least you didn't have to communicate through his tabloids.

Underneath all of this seems to be this assumption that Zuckerberg, Jack Dorsey etc. are benevolent, and won't betray you. Putting aside whether that's right, it's incredibly short-sighted. Jack Dorsey owns 2% of Twitter's stock. Twitter is owned by index funds - they have control, not Jack. You don't want private equity dictating what kind of propaganda you're allowed to see.