Another Predator

So....this man sends me a friend request on facebook. I didn't know him, but accepted anyway as we have a mutual friend (female). I asked her about him today & she tells me what little bit she knows. he then starts conversing with me privately on facebook. He very quickly starts directing the conversation toward sex & becomes snippy when I don;t answer him immediately once because I'm at work. Then our mutual friend sends me a text just now to tell me to unfriend him as he sent another one of her friends a very sexually inappropriate message. Seriously???? Am I just a predator magnet, or is that all tht's left?