Taggart 
It was my job for a decade to try to keep tweens and teens safe online. Let me tell you what you already know: no law or technology can do it. There are no lengths kids won't go to to talk to friends without prying eyes. The harder you try to lock it down, the dodgier their solutions will be.
Tarale@mttaggart someone I once knew was a very experienced computer engineer and no matter what they did their kid circumvented it. At some point they realised they were just training the next generation of security professionals.