I set it up so I could "Like" various commercial sites that occasionally offer discounts or coupons, and then while I was at it, I began adding friends. I can't remember how or why it suggested these people, but I sent out a few requests and before I knew it, I had over 500. Most of these were people requesting friendships from me. Go figure.
My profile picture is an image of a prominent British actor, but somehow most Americans don't recognize him. I've never had a single FB friend comment on it.