I have a facebook, I'm not on it very often, but I do check it every few days. It's an easy way for me to keep in touch with friends and family that don't live nearby, and to share baby pictures.
I keep getting friend requests from people that I have no interest in being "facebook friends" with... the IT guy from my work (that I've never met in person), DH's wierd friend Paul that's in the middle of a nasty divorce and has a bunch of skanks on his page, this random guy Ruben I went to high school with, etc...
Do you just leave the request in your inbox and act like you haven't seen it? Click "deny" (is that rude?)?