As recently as the '70s, people were forced to see information that they didn't agree with in newspapers and the like. Now there is so much information you really can build your own walled garden that just has the stuff that reinforces your view. I think it applies to all of us. People are really going into these separate camps, and that's the big social challenge in this age of too much information. How do we crack that and create a common dialogue?

I worry about a society that can remember everything.

Never mistake a clearer view for a short distance just because the technology looks like it's about to arrive in the very near future. Chances are there will be some surprises and in the long run even the most expected of futures tends to arrive late and in completely unexpected ways.

People were touchingly naive at the dawn of the Internet revolution when they said the Internet will route around censorship the way it routes around damage. With any revolution, the establishment catches up and figures out how to screw it up. The answer is to keep technology advancing fast enough so that those who would try to control it can't. It's up to people to defend what they care about. We shouldn't be complacent that this stuff is going to be a force for good.

The arrival of television established a mass-media order that dominated the last 50 years. This is a personal media revolution. The distinction between the old order and the new order is very important. Television delivered the world to our living room. In the old media, all we could do was press our noses against the glass and watch.

I'm actually an optimist about what lies ahead. Are wikis reliable? It depends on the specific business. Is Wikipedia reliable? You bet. Wikipedia is a researcher's dream.

You don't want to rely on an expert to tell you what lies ahead.