I once got paid $20 as an undergrad to go through hundreds of thousands of tweets and convert slang into plain english for training data. The only thing I took away from the experience, aside from finally getting good with vim macros, is the average tweet is really low effort an uninteresting. I don't recall reading a single thing that I would imagine someone retweeting (think that's what it's called). Maybe I was given only replies. Anyway, not sure if there's value there for LLMs, but I'd be skeptical.