[mirimir]

No, having functional Google and Facebook accounts that they can use to anonymously mess with people.

Basically, you need clean IPs and mobile accounts. Tor and VPN exits don't work so well. Creating your own VPN in a VPS sometimes works. But I gather that the pros use botnet slaves with genuine residential IPs.

[icebraining]

For Facebook you don't need an exit node, they have an official onion address, facebookcorewwwi.onion

[mirimir]

Good point. I bet, though, that creating an account there triggers heavy-duty authentication.

And that reminds me. I recently tried to create a ProtonMail account via Tor. But they wouldn't activate it without mobile and credit/debit card numbers. Ironic, no? And yes, I do get that many jerks have misused ProtonMail accounts.

Edit: I take that back about Facebook. Via the onion, it just wanted an email address to authenticate. I'm impressed.