Mine is my signature, I've already ignored a couple peoples FR's that probably were trying to reach someone else (didn't recognize the name, pic, etc...). One person thought I was stationed with them in FT.Riley, so I know they had the wrong person.
Facebook is so great though. I have come to really understand it's greatness thanks to a couple people on here, and my aunt telling me it was a great way to reconnect with people. I'm now in contact with quite a few relatives that I haven't seen in years, and it is so nice to correspond with them.