[bcherny]

FB actively takes down groups and blocks users that (1) break FB’s community standards or (2) do really bad stuff (share child porn, recruit terrorists, etc.). There are manual and automated ways to do this. Users have a way to report bad stuff to FB and to group admins, and FB has a way to send really bad stuff to authorities when complying with a warrant. IIRC the majority of Meta’s employees (tens of thousands of people) work on these safety systems.

So yeah, Meta takes it really seriously. It doesn’t work perfectly because the scale is mind-boggling, but it’s probably the best system of this kind at this scale, and it is constantly being evaluated, red teamed, and improved.

Source: I used to work on FB Groups.