Employers asking for facebook login blog

In my opinion employers have a right to ask for facebook passwords. Because he/she should be responsible and know not to put certain things on facebook. It's true that adjusting your privacy won't protect your facbook page from other people seeing it. He/she should never give somebody their login information. Not unless you know who that person is. I think everybody should use the grandma rule. Especially if you dont want your personal stuff in the open.