I am that PP - the actual term I use is "international" bad ass. Oh how I wish DD were not that way, but I'm playing the hand I'm dealt...
Another tip - learn how to log into your router and change the default wifi password. If you ever confiscate a a phone or computer or ipod, your child WILL borrow someone else's, and this way they cannot connect to WIFI without you knowing.
Agree on computer in public area. We've toyed with a keylogger, but are able to keep a reasonable amount of activity tracked via history, and I'm not sure we want to know EVERYTHING - just what we need to know to keep the trouble at a garden-variety teenager level. More later- there are quite a few things we do - none of which are foolproof otherwise I wouldn't have to think of this crap

Have to maintain your sense of humor.