FaceBook is an interesting concept. I am probably the oldest user currently using it.
I wish I had it when I was in school. Being able to link friends and each person in your individual classes is cool.
For those that have not seen it.....Imagine a free classmates.com-type website where you enter in your profile. Then you can flag people as your "friends" and they are then linked to you. You can then determine if anyone in the entire database is linked to you somehow. It's sort of like a "you are five people removed from anyone in the world" concept.
You then enter in what classes you are taking, down to the course number. You can then find out if you know anyone taking the class, or if any of your friends know anyone taking the class.