You can't get married to any one particular plan. That is the biggest lesson I learned at PayPal.

We're all put on Earth for a limited amount of time. Am I using in a way that is great, or good enough, or wasteful?

Mobile is the perfect example of what is enabling economic growth in the technology sector.

Media is very different from financial services. People are very fickle and very vocal. They believe that things should be one way and not the other. It's still very rewarding to build products for huge audiences. It feels like you're making an impact.

If you can work a brand successfully into the narrative of your product, then it's really cool. Then people actually take the brand up and say, 'My positive experience in your product is directly connected and influenced by this brand and that worked great.

PayPal once rejected a candidate who aced all the engineering tests because for fun, the guy said that he liked to play hoops. That single sentence lost him the job.

The single most important top-level trend is the shift to mobile.