If you check the thefacebook.com for updates, you might notice some “friend details” confirmations waiting for you. That’s because facebook now allows you to define what it thinks are critical aspects of the relationships you have with your friends:

You can specify any of the following attributes:

Lived together
Worked together
From an organization or team
Took a course together
From a summer / study abroad program
Went to school together
Traveled together
In my family
Through a friend
Met randomly
We hooked up
We dated
I don’t even know this person.

Of course, given the facebook’s known CIA ties, you may be leery of providing them with this much information…