LinkedIn recently suggested my neighbor from 1995. I didn't even have Internet access, let alone an email address back then. I haven't had any contact with this person since.
Also, how much of the perceived "creepiness" of someone searching for someone on LinkedIn just a variation of this: http://thedoghousediaries.com/1042 ?
I got questions like; "At which of these 5 addresses has $BROTHER ever lived before?" And one of them was correct.