I doubt it's really Facebook creating fake accounts and using proxies, why would they keep their real UA then? Anyhow, I occasionally suffer this same problem

I doubt it's really Facebook creating fake accounts and using proxies, why would they keep their real UA then? Anyhow, I occasionally suffer this same problem when happy crawlers find my site and use truesign.ai to block them, so far successfully. It detects residential proxies, fake emails and overall suspicious activity, and - something I really wanted to avoid - there are no captchas.