I gave up telling them they were wasting their time, and now my spam filter takes care of FB headhunter spam for me, as it should.

FTR, I do think that's a bit unfair. Judging other peoples' circumstances is a perilous pursuit.

But I will say FB is parasitic on and dangerous to society and is run by amoral shitbags, I don't believe anyone with a sense of ethics or self-respect should work there.