I'm pretty sure initially they said the number was only used for two-factor authentication. Who in their right mind wouldn't want two-factor authentication? P

I'm pretty sure initially they said the number was only used for two-factor authentication. Who in their right mind wouldn't want two-factor authentication? Particularly as other sites were offering it (and haven't changed their terms), and a significant portion of the tech press were saying it's a good idea — and it plainly is a good idea, of course.