Those folks taking part in the "what song was number one on your birthday" - just wondering if you realise you're basically telling everyone what your date of birth is? Good job that's not used as a security question or anything...

Heh, though only to within a week (or even less precise if that song was at nr 1 for many weeks)

Yeah, granted. Wouldn't want to bet on that being too much of a hurdle for people to take advantage of it though!