I understand that employers, just like employees, need every advantage they can get. But some events in my own past (namely, getting stalked) have led me to thi

I understand that employers, just like employees, need every advantage they can get. But some events in my own past (namely, getting stalked) have led me to think that gathering details about someone on the Internet without their knowledge is in some ways even creepier than openly asking them for their Facebook password. Do you tell candidates that you're going to google them? If yes, do you give them a chance to ask you not to do that?