I see a lot of "People you may know" on Facebook. The thing is, my Facebook contains quite a bit about me. They need an "acquaintance" mode or something.
"Yeah, I know this person, but they smell bad so I don't want to know too much about them and I don't want them to know much about me."
But at least they're added to your network.
Or whatever. Look, I'm really tired and exhausted. I'm gonna play some Civ IV now.