Invasion of privacy. The government (jobs are watched by the government) has no right in that. It's in the freaking Bill of Rights. Nowadays people do post the most ridiculous things on Facebook, which is why I can see they would ask such personal information. I'm not necessarily talking about me personally, but what about the others?
I don't have anything shameful to hide on my profile. Most of the time I'm on a Kingdom Hearts group set up on Facebook.