I'm quite bullish. We're coming up on year 15 of a flat stock market. Historically that's a pretty good sign. So I'm not a hedge-fund manager but if I was I think I'd be feeling pretty good.

Every kid coming out of Harvard, every kid coming out of school now thinks he can be the next Mark Zuckerberg, and with these new technologies like cloud computing, he actually has a shot.

Companies in every industry need to assume that a software revolution is coming.

There will be certain points of time when everything collides together and reaches critical mass around a new concept or a new thing that ends up being hugely relevant to a high percentage of people or businesses. But it's really really hard to predict those. I don't believe anyone can.

The decline of violence isn't a steady inclined plane from an original state of maximal and universal bloodshed. Technology, ideology, and social and cultural changes periodically throw out new forms of violence for humanity to contend with.

Now that digital lifestyle devices, tablets, wireless phones, and other Internet appliances are beginning to come of age, we need to worry about presenting our content to these devices so that it is optimized for their display capabilities.

For much of this decade, both Congressional and administration budget projections showed a decline in science and technology accounts of between 20 and 30 percent in real dollars. The real impact to date has been far less severe.

Ten Internets ago, when PayPal was started, it was all these tools that no one had built yet to bring commerce to the Internet. My first startup used PayPal.