Actually, I disagree. Twitter is not, at present, owned by any single person and no single individual can use it i as their own privarte, exclusive propaganda mouthpiece.
Twitter is being used as a propaganda mouthpiece by many, many hundreds of thousands, and even when that involves the outrageous, but not demonstrably false, it can stand as free speech. But Twitter, like all social media, is a publisher, and they should be held every bit as responsible for vetting that content for accuracy as any other reputable publisher is. They can't, like a newspaper can, do this "before the fact" but they certainly should be monitoring content for factual accuracy and pulling down blatant falsehood and misinformation quickly, as well as blocking the accounts of repeat offenders in that sphere.
The entire internet as a whole should have had "evolutionary regulation" as it bloomed into being and maturity, very much modeled on what was done for public media (even in private hands) historically. But it wasn't, and the Wild Wild West has just kept getting wilder and wilder, the damage to the public at large from it more and more serious, and it's being treated like a third rail that simply cannot be touched by regulation.
I'd say "something's gotta give" but it's already been giving and in a very, very damaging way for our society as a whole.