I would happily leave him alone if teenagers the world over used good sense on a daily basis. However, they have been known to make some pretty dumb choices and today those can have serious and long lasting consequences. In my day, a teenager could afford to make a bad choice from time to time without it following him around for life - or ending up on youtube within minutes. I am not trying to control - just do my job as a parent as best I can. This is new to all of us.
My kids are already grown, so I think I can certainly understand your quandary
Unfortunately, I would suggest you won't get much sympathy around here
Many of the responses you get will come from kids themselves looking to berate you
Others may not technically be kids, but are of a more liberal persuasion and feel you should let them do as they please
Google will be a friend to you, even if it is difficult to find things
The bottom line is, you are not likely to get much support in the techno world for this
There are no easy answers
But keeping communication open with your child will be the best course of action
My recommendation is to take this out of the public arena though
A board like this is just going to open you up to abuse
Woof, Woof - Dawg