Perhaps Nicholas Kristof (whom I do admire) hasn't been keeping up with his John Dewey.
In today's New York Times, he writes:
When we go online, each of us is our own editor, our own gatekeeper. We select the kind of news and opinions that we care most about.
Nicholas Negroponte of M.I.T. has called this emerging news product The Daily Me. And if that’s the trend, God save us from ourselves.
He worries about this because "we generally don’t truly want good information — but rather information that confirms our prejudices" and implies that the situation is new to the Web--conveniently forgetting that New York City, a century ago, had more than a dozen major newspapers (not to mention all of the smaller ones, the newsletters, the magazines, the flyers) and that readers were feeling exactly the same then, and acting exactly the same.