[snowwrestler]

Free speech protections in the U.S. make it extremely difficult for a company to pursue consequences for this sort of thing.

A previous employer was pranked via impersonation that was far more elaborate and convincing than one fake tweet. The corporate lawyers were able to get the fake website taken down, but any legal action beyond that was quickly dismissed.

There's also the "empty pocket" problem; it's not like Eli Lilly is going to actually get $billions in compensation from some random person on Twitter. The lawyer time to draft the complaint would probably cost more than the best possible award they could expect.