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.

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

Ignore your mistakes. The number one thing to worry about is -Am I doing what I'm good at?

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

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

The very first company I started failed with a great bang. The second one failed a little bit less, but still failed. The third one, you know, proper failed, but it was kind of okay. I recovered quickly. Number four almost didn't fail. It still didn't really feel great, but it did okay. Number five was PayPal.

You can have successful teams where people hate but deeply respect each other; the opposite (love but not respect among team members) is a recipe for disaster.