Who was hosting the site that you could shut it down? Google doesn't have sites? (other than free "blogs" at blogger.com?). If you had just gotten an e-mail then I'd think it was just a random "junk" piece of scam but I guess it's possible for people to use a random email address to create a free site. I can't understand how you'd be able to "shut it down" though? you wouldn't know the password. (I have a free blogger.com site).

Whatever it was, it wasn't "you" so I wouldn't worry about it (unless it used your "real" name/address). It's not like your friends/relatives would be looking there and the very few other people looking have no clue who "you" are so what does it matter? That's why I have some paid-for accounts; the "free" ones (GMail/Google's) are too likely to be messed with.