What did he do that was deemed suspicious? Send a large number of friend requests very quickly after joining (<24hrs? 1wk?)? Follow requests? Upvotes? Log on from multiple devices in multiple locations? Put third-party links in his bio or profile?

(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.)

I had the same thing happen on both Facebook and Twitter. The answer is: nothing.

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.

If they suspect you're trying to ban evade they'll ban your account but their ban evasion detection is trigger happy.

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