I have nothing to hide
I know you are not a terrorist but still you give privacy for understood in many aspects of your daily physical life. You expect it every time you go to the bathroom and close the door, you expect it when you go to the doctor or you confide to a close friend.
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Everyone has things that keep to themselves, things that only say to a special person, things that can be shared with close friends or family, things they talk only to a doctor and so on and so forth.
If in real life we have so many layers, why don’t we expect the same level of privacy on internet? We are giving to Facebook, Google, Linkedin and the others more information about ourselves than we give to our SO or even to ourselves (remember Google is investing in DNA mapping).