Breakthrough ideas look crazy, nuts. It’s hard to think this way — I see it in other people’s body language, and I can feel it in my own, where I sometimes feel like I don’t even care if it’s going to work, I can’t take more change. O.K., Google, O.K., Twitter—but Airbnb? People staying in each other’s houses without there being a lot of axe murders?

The multipurpose device will always fail.

More and more major industries are being run on software and delivered as online services—from movies to agriculture to national defense. Many of the winners are Silicon Valley-style entrepreneurial technology companies that are invading and overturning established industry structures. Over the next 10 years, I expect many more industries to be disrupted by software, with new world-beating Silicon Valley companies doing the disruption in more cases than not.

Learning to code is the single best thing anyone can do to get the most out of the amazing future in front of us.

Whatever you're selling, storage or networking or security, you're going head to head with the incumbent players.

All's fair in love, war and ride-sharing.

I think 2012 is the year when consumers all around the world start saying no to feature phones and start saying yes to smartphones.