[radlad]

> I personally doubt it was the Tweet itself that caused the drop. No one should/would have believed it was an actual statement by Eli Lilly.

Your second sentence is probably true, but the first one is questionable.

It's well-known that there are high-frequency stock trading bots which watch Twitter, news headlines, etc.

[ALittleLight]

High frequency trader bots watch random accounts? That seems like a bad strategy. Maybe they're watching news headlines - but that seems like a media problem where a storm of articles about nothing drive the very story they are talking about.