Actually something related happened to me with my daughter when she was in 7th grade. She has internet access as long as she followed simple rules - no establishing accounts on websites without our prior approval and without us having her id and password.
Well, she didn't realize that dumb old dad was a bit more technologically savvy than she was and I found a MySpace account where she was being trolled by a 26 year old. After I found him and addressed the situation with him personally I addressed it with her. She fessed up and so, in keeping with the maxim that if you tell the truth you will be in a lot less trouble I did not levy a penalty.
So a week later I found one of her other accounts where she was telling the story and talking about she was still getting to her secret accounts that dad didn't know about..ha ha.
Yer gonna think ha ha.
She had no technology access at all and very little freedom for almost a year and did a whole lot of work around here. Like the mule, sometimes you just have to get their attention.