It could, I think i read something about it. Probably not much, reason it might hurt your ranking is a lot of spammers like using a contact cloaking registrar to hide their info. Google may think you're one of these spammers, it's better if you use your real info. If you're afraid of people finding out where you live, use a fake an address They don't check, save a couple bucks, i dunno how legal that is though....