What the Hell Am I to Do With Facebook's Suggested Friends?

I have about 20 “suggested friends” in my Facebook friend requests inbox and I have no idea what I’m supposed to do with them. I understand the basic concept. One person is introducing me to someone that they think I should touch base with. What am I going to say to that person though? “Hey John, Mary suggested that I ping you. I have absolutely no idea who you are or what you do but hi!”

The suggested friends section has to be one of the most useless features on Facebook.