It's easy to blame someone for who their friends are, but that's ignoring social norms which end up being set by the Facebook sluts. I think in actuality most people only rarely add friends, but tend to accept almost any friend request from someone they've met in person—it's awkward not to.

My solution to this problem is just to post anything questionable or private to Facebook at all; it's a much more comprehensive solution than hemming and hawing over friend requests.

I don't consider them friends. I think of them as contacts, maybe acquaintances. You know, social connections. Facebook calls them "friends" but that doesn't mean I do.

Coincidentally, Facebook now lets you add people to an "acquaintances" list, and easily set privacy on things to all of your friends except your acquaintances.