it happens to me too...it's so annoying receiving spam from a site you are not even in.
some time ago someone even create an account with all of my data and even the password I usually use...I didn't know anything about it until I got a friend-request at my email and was pretty confused....I got the account deleted but never discover who did it =_='

nu, it was at place until some days ago...I've looked averywhere but there is not a trace of it, how strange XD