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.

Right now, nearly all the apps on Facebook take a week to build. No more.

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.

Having a highly homogeneous background, education, values, preferences, etc, in the very early team is better than not - cuts down on time-wasting arguments.

Facebook is so ubiquitous now that it's like another manifestation of the web itself.

Think of Slide as a giant media network for people to transmit information. The content that's in there now has been provided by users - it's whatever they want it to be.

Technology has come a long way since PayPal.