The problem is no one can prove it is a monopoly “in restraint of trade.”
FB/Twit erect NO “barriers” to entry, other than the fact that people voluntarily flock there. Any conservative wealthy person could create such a network, only none do.
A shift “might” be possible if a real alternative, such as Gab that fixed its problems and became user friendly, were to see President Trump abruptly leave Twit and join. Immediately about 50m followers would go there, and probably double as each of those undoubtedly has a few people who don’t follow Trump.
But legally, you’d find it difficult to justify the “barriers to entry” clause. Just because no consumers want to buy your product does not constitute a barrier to entry legally.
that is why the only option is regulation as a utility
Lets say a prospective employer rejects you for something you posted at one time on Facebook?