This makes no sense. If I send off an e-mail to multiple people, does that negate my right to privacy? How many people can I talk to at once online before som

This makes no sense. If I send off an e-mail to multiple people, does that negate my right to privacy? How many people can I talk to at once online before someone decides that my conversations are not considered private? If I have two friends on facebook, and I make a post but set the security so only one person can see it, is it not private because I posted it "in such a public place"?