There’s also data suggesting that either non-Internet users are paranoid or that those on the net are naïve: 27 percent of non-Internet users think that “most people can be trusted,” compared to 46 percent of Internet users. (Frequent Facebook users are 43% more likely than other Internet users and more than three times more likely than non-Internet users to trust others.)

via Social Marketing “Experts” Don’t Know Jack About Facebook, Twitter, and Their Kin | BNET.
 
I've observed this behavior before and I've always thought it was interesting how scared people are of other people. Why should we be? If everyone was friendly and tolerant of others, life would be so much easier. Everyone would know who the "bad people" were because we'd be sharing our bad (and good) experiences with each other. There's a lot of hype about "online privacy", most of which is caused by or originates on Facebook. What does that mean, really? What do we have to be afraid of? Using the tools available to us through the Internet to communicate, such as Google+, Facebook, and Twitter, we can get to know people in a way that was never possible before.. with very little risk. Hopefully as a society we can become more open to and trusting of other human beings.