Is my iPhone making a mistake?

I got notified today that this guy on fb tagged me and 8 other people in a status, and this happened a couple weeks ago too, same guy. The weird thing is that when I go on fb there's no evidence of that and we aren't fb friends, I don't know him, we just have one mutual friend. So is my iPhone making a mistake or something?

Sometimes your friends can tag you in a post that this guy originally posted. Is this the case? If not then the guy probably just randomly tags people to get more likes on something.