There’s always one person that ruins it for the rest.
It’s like punishing all people who drank alcohol at some point because one or two people ran over someone while drunk driving.
And to answer your question about Facebook, a person can easily use a fake name or variation. Personally, I think social media should be restricted to those over 18, unless the parent(s) are going to monitor all communication. That opens a whole ‘nother can ‘o worms then.