Twitter is a private company that can make it's own decisions and be judged in the marketplace of ideas as either a useful place to go or not. The government shouldn't regulate or have any oversight over them in the same sense they shouldn't have had oversight over the magazine rack at the checkout line, between the Sports Illustrateds, Glamours, Cosmos, or National Enquirers.
A bookstore can decide what to stock and sell. If they want the nudie mags in with the others, so be it. That's between them and their customers. If they don't want to stock them or guns and ammo or bibles or gay magazines... so be it. Same with Twitter, Facebook, Instagram, etc.
No crime was committed.