This is a dirty secret, but they do employ teams of multilingual speakers to review flagged posts and I’ve been told by a lady who works on one of these teams that a lot of CP gets passed around on Facebook.

This is why I deleted Facebook and Twitter. Both facilitate and protect child abusers. A Christian mother I followed brought attention to groups that were dedicated to this, and they shut her down for breaching their guidelines. As far as I know, those groups are still there.