I have a sadistic stepdaughter who did similar-- on one occasion, I caught her catfishing lesbian girls and publicly accusing them of sexual abuse. From talking to a few of her (now ex-)friends, this was not an isolated incident. Enough of her lies caught up to her that she ended up changing schools, crying victim the whole time.

Kids these days know how to exploit privacy laws, be it HIPAA for their Munchausen-by-internet campaigns or anti-wiretap laws to conceal their targeted cyberbullying.

Evidence obtained from someone else's phone is generally inadmissible, so anybody positioned to discover such activity is going to have trouble reporting it.