There was a "Sign up for more" link hidden behind any + button next to any idea. I clicked it, and a registration form popped up, which asked me (among other things) for gender.

BTW. still didn't get a confirmation link :). Also, can't see any indication that I'm logged in, but the "Sign up for more" link got replaced by "Add to favourites". Did I break something? :D. I guess you're working on this site as we speak.

Thanks for that one. I've no got rid of that link and replaced that space with the comments.