Personal anecdote: I had a job offer from Facebook and a couple other big tech companies. The Facebook offer was substantially better fiscally than the other ones and it was clear to me that they were having trouble hiring. Their initial equity grant has no cliff and the signing bonus was massive for somebody two years out of school: $75,000 cash in first paycheck.

However I ultimately turned it down because of ethical concerns about working there combined with a sense that people would not approve of my job choice. I.e. even if I don't find what they're doing ethically questionable (and I do, although I don't think they're so bad), I didn't want to have to explain myself or defend them to everybody when I mentioned where I worked. Just my two cents as somebody who was one of the 50% of candidates who turned down the job.