Agree in principle, but that becomes hard/impossible at the scale Facebook and friends operate at. Monopoly isn't the right term, but it's close.

I'd welcome laws that requires specific kinds of transparency and conduct at Facebook/Reddit/Twitter/YouTube user counts. Simply tie this conduct to S230 protections, and we evade all first amendment issues. The companies would do anything to avoid being responsible for the hateful, libelous, harassing, and terroristic content they convey every single day.