The Internet not a meeting of minds
This is depressing, but probably true. Ethan Zuckerman, at the current TED, notes that the Internet makes us think we being exposed to, and learning from, differing world views, but that, particularly in relation to social networking, we are usually simply seeking out similar views to our own, and reinforcing our existing viewpoints.
(I like the “imaginary cosmopolitanism” phrase. It reminds me of being in NYC.)
(If you can’t see the security implication in broadening your outlook, there is no hope for you.)