Being an entrepreneur is not about being in love with an idea, it's about being in love with running a company.

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.

I've been developing mobile for years before anybody else really thought it was that important.

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

I think the hallmark of a really good entrepreneur is that you're not really going to build one specific company. The goal - at least the way I think about entrepreneurship - is you realize one day that you can't really work for anyone else. You have to start your own thing. It almost doesn't matter what that thing is.

If we compare the two, Facebook is currently a superior place to market a product like Slide. Twitter is more like a general distribution agent. It's like broadcast radio.