I don't have much data points to share. But I've been seeing responses to people working FB have been horrible since for a while now.
It has been a common trend that when someone I know posts a job position in FB, nobody replies to it. At least not publicly (publicly means replying to tweet, replying to slack message in a well knit/known group of people). Even if they are replying personally and privately, that in itself shows a problem.
When I see someone working in FB, I can't deny that I am judging them. At this point, there is no reason to give a benefit of the doubt to how bad FB is to people, democracy and humanity in general. Sure, you can argue with technical meritocracy of some tech they produce. But how long can you sell yourself that excuse really when on the other side, adverse effects are mounting up?
As nerdy and smart as tech workers are, we are still in need of validation from others right? There definitely should be some effect on people being perceived as a bad person for working for a bad company even if it is paying a ton. FAANG engineers should be more than equipped to look elsewhere because of it.