That only bans employers from asking for passwords. Facebook doesn't need to do this because they already have all your data, no passwords needed. Also I read

That only bans employers from asking for passwords. Facebook doesn't need to do this because they already have all your data, no passwords needed. Also I read through the text of those laws and they all specifically say that they are not limiting the employers right to monitor their own systems in any way. So Facebook looking up how their employees use Facebook would be completely fine under those laws.