What is your teenager doing?
On the other hand if you are the parent of a teenager running amok and you don't know what they're doing I know how you can find out. You will be surprised what you can find out simply by searching their name on the Internet.
1. Use more than one search engine, google usually offers the best results.
2. Search with first and last name only.
3. Search with first name and your city.
4. Search with last name and your city.
5. If you know of an id they like to use search with that. (I.E. Lisaschaos)
6. Still no results or not enough? Go to myspace and search (3rd from the left - Home, Browse, Search . . . ) scroll down to find a friend and try your child's name or a name of one of their friends. IF that shows empty (doubt it will) you can try the "Classmate Finder" School = name of your city State = your state then narrow your search with your child's age range. For my 17 year old I used 15-20 years. Once you have found a few of their friends you can read the comments and click to other friends from their page. Don't forget to click on their profile photo where you will be able to view other photos - possibly some with your child in them.
By doing the above I have found where my child usually is when he's not home and I know when parties have been and found photos of my son with beer in one hand and a cigarette in the other. From the notes they leave each other I have been informed "Last night was great, Khris puked twice." By the date on the comment I know when "last night" was and at least two people who were with him.
You will probably be surprised at the information you can find out about your children. Then you just have to figure out what you're going to do about it. I think the handcuffs I have ordered should be arriving any day.
Along with those handcuffs, you could try a shock collar, I suppose. As
evidenced by that idiot on America's Funniest Home Videos (who put a shock
collar on himself and won ten grand), a collar turned up to six gives a
pretty darn good poke.