Comment by sergers

I am surprised their system for catching bad content is only user reports/flags.

While revenge porn and stuff is bad, there are a number of known child related incidents.

So if a private group of scumbags, are posting stuff to a private group, noone will know unless someone within reports.

Who needs the darkweb when u can have a private Facebook group?

Edit: as per replies below, they do use image recognition aswell for I guess known content lists