[john_the_writer]

I don't understand that "behind parents back" bit.

My teen kids aren't on social. I know this because their dumb phones don't support it, and their computers are not permitted in their rooms (Kitchen table only).

I suppose they could get on, through a friends smart-phone, but that would be limited to the time they spend on the bus to/from school.

[meindnoch]

How do you know they don't have a second phone? E.g. a friend gave them their old phone.

As a kid I was doing graffiti, and later drinking and smoking weed without my parents knowledge.

[john_the_writer]

1. none of their friends have the money to have an old phone.

2. When would they have the time. They're home, and at school. Band, Judo, Cadets, Tutoring. Where's the time to hide a phone.

3. I'll stipulate that some kids could do it. Vast majority would get caught. And my kids fear the pink bunny suit I have in my closet. I'd walk them to school every day for a month. Lets seem them stay on facebook through that. :)