Not using Facebook doesn't help either though. My new co-worker didn't have one but needed it for his job so he made an account and was immediately flagged for suspicious activity.
(LinkedIn ramped up anti-bot/inauthentic-user heuristics like that a few years ago. Sadly they are necessary. Near-impossible for heuristics to distinguish between real humans with inauthentic or suspiciously commercial behavior.)
In both cases for me, I had signed up and logged in for the first time, and was met with an immediate ban. No rhyme or reason why.
I, too, needed it for work so had no prior history from my IPs in the case of Facebook at least. So maybe that's why, but still. Very aggressive and annoying blocking algorithm behavior like that cost them some advertising money as we just decided it wasn't worth it to even advertise there.