Bosses Spying on Facebook

How we dress ourselves, what we say and do all presents an image to viewers.  The same remains true online but at a much higher viewing scale.  In my opinion, if one leaves there social media site open to the public viewers they should be open to responses, whether good or bad.  Employers best assets are its employees and they should have the right to view their public information.  On the other hand, if an employee doesn't want their boss viewing what they did over the weekend or wild twitter comments they may have made then they should lock up their accounts for close friends only.