This mother actually did close facebook, even moved her kid to a new school. She did quite a bit more than many parents would have and it still wasn't enough. I don't think it is reasonable to put a 24/7 multi-year, constant surveillance burden on the average parent.

And what about enforcement? So you see bad stuff on your kid's phone repeatedly...in the end all you can do is take it away. Then they go to the computer. Then you take that away. Then they stay after school to use the computers there. Really I don't expect the symptom mitigation solutions to be very effective.