Ah, but now you're living in the future, where the cops can use the miracle of social networking to nail you for crimes you didn't think anyone really gave a shit about.
Let's say you've gone off to college and, though you're still two years under age, you attend a party and have 27 beers. Your socializing has paid off--the next day you get a friend request from a cute girl on Facebook. You accept it and a few days later, you get summoned to court and fined for underage drinking.
It turns out the cute girl was actually a cop. In Wisconsin the police are using the fake profiles to get access to kids' photo albums. Once in, they find pictures of them or their friends holding beers. Charges filed. Case closed.