Facebook (US college students)
 

This is aimed at college students in the US. There's a website (Facebook) that essentially links college students across the country. My school's been on it since this past February. Basically, it allows you to create a public profile, list classes, find friends, etc. Pretty cool stuff, though your school does need to be a member in order for you to register. If your school isn't supported, there's a place where you can petition the designers to add the school. Pretty cool stuff.

Thanks RMadd I checked it out and they actually have my school..pretty cool even for an old woman like me...lol!