Do I count?
I'm 21 and I use Facebook. I'm addicted though, so I might be biased.
It's a good tool for keeping in contact with people, it's easier than email and you can keep people up-to-date with what's happening to you without them having to ask all the time.
It's fun. It's not for everyone though, but I know of plenty of people who got it to keep in contact with just a few different people.
Also, for anyone who doesn't know what Facebook is:
htttp://www.facebook.com/
It's a social networking type site, sorta like MySpace, but in my opinion - better.
*shrugs* If I can answer any specific questions Candy, let me know.