FB recruiters are super aggressive and I have zero qualms unloading on them for their BS behavior, every. time. I've asked five (5!) times to be taken off their list and added to a blacklist for candidates and I still get emails, calls, and LinkedIn messages. The first two "buzz-off" messages were polite, but now I'm just downright rude and respond with my actual opinion on their employer (and subsequently what I think about them working for that employer).
Facebook is a bad company that does bad things. If you work there, you're gross.