Twitter could make itself real interesting if it took "community notes" web-wide. So many attempts at this have tried and failed, but Elon may just have the itch, audience, and disposable money to do it. Would also necessitate forking a special browser, since there would be no way to support web page comments in a first-class way in stock mobile browsers.
My recollection is that Gab made a plugin for browsers called Dissenter that did something like this, but they were banned from the Mozilla and Chrome stores under their moderation/censorship policies. I’ve never used it but I think it created a discussion on top of any URL. They ended up making a browser fork of Chrome but it probably went nowhere.