I should direct him to LinkedIn probably, right? Just may have answered my own question...
I'm a freelancer and the President of a company I used to do a lot of work for (but don't at my own request) just sent a Facebook friend request.
Hmmm. I think I've met him once, maybe? We do have two mutual FB friends of people who work/ed at the company who I did know and did a lot of work for and I'm guessing I must have come up as a possible friend for him.
Or just leave it in a limbo?
My first odd(ish) friend request!