You gotta love technology. Remember when you first started using email and YOU were 'that guy' who sent all the lame chain letters to all your friends? Then it was your aunt or your grandmother but there was always someone just discovering what you already knew.
This just happened to me on Facebook.
I got a friend request. It looked like this was a suggestion from another friend. When I have no clue who this person is or how they found me I usually follow up with a message and ask. In this case I said something like, "Hey, how do you know me or of me? Looks like Jeff recommend me to you, what is the common interest?" Here is what I just got back.
[some name]February 9, 2011 at 2:24pm
Re: friend request follow-up
I am not sure, I went to high school with jeff. I am very new to facebook and may have clicked something I was not supposed to. My real name is [some other name].
Priceless.