You make a profile on a public social networking website. People will look at it. You cannot seriously have any expectation of privacy there !?!?
Best you can do is lock down your privacy settings so that random Facebook users can't see your employment status amongst other things.
To put my comments into perspective: Every year I donate to the
Electronic Frontier Foundation. I am connected to a 256bit encrypted VPN connection, just sent several encrypted e-mails and don't fly to countries where they fingerprint people for fun, so I am all about privacy.
What would cross the line for me is if they made a fake account and friended me to see my "friends and family"-protected Facebook data or my "My contacts"-only LinkedIN data.
But what you put on public Facebook, LinkedIN or Google+ profiles is fair game IMHO.