In general, I'm strongly aligned with Nikki & Scott here.
The one thing that I will call out is that recently in a FB group I'm in, someone(s) was abusing the Anon feature and posting things against the group rules/guidelines consistently (as in, reminded it was not appropriate, deleted, reposted knowing it wasn't allowed).
They were able to remove the person because the admins knew who was posting it (FB groups show who the anon posters are to admins and not members).