The "calendar" on this site seems to have people's birthdays. Half of what you need to steal somebody's ID is the date of birth. That information should not be made public.

 

Well, this is something that each user can modify to protect themselves. Under "UserCP", "Edit Your Details", the second item listed is the privacy for your birthday. You have four different settings. One of which is hide your age and birthday. So this is really on the members to change. What I do find interesting is that the calendar seems to end in 2012. LOL

 

Yeah, I think they planned on the world ending on December 21, 2012.
As far as people being able to protect themselves, of course they can if they think about it, but there's no reason for this website to collect that information at all and certainly no excuse for making it public. You Facebook people should keep in mind that identity thieves can get useful information about you when Facebook sends out their unneccessary birthday reminders to all your "friends".