At Twitter, mobile is in our DNA ... For us, it's all about mobile, and it always has been.

Design is a career where you learn creative decision making.

The two things I use the most are the MacBook Air and my iPhone. Those are my two most-used gadgets that are dented, scratched and smashed.

The determination that led me to create a new sports team taught me an important lesson: opportunity is manufactured.

I started designing book jackets, which was great because I was good at it. And then from there I decided to become a freelance graphic designer and I needed to expand beyond book jackets, so I taught myself web design, and then in 1999 some friends of mine decided to start a company called Xanga.com, which was a very early kind of social network slash blogging community.

Timing, perseverance, and ten years of trying will eventually make you look like an overnight success.

The thing that excites me, and the thing that excited me about Twitter, is the idea of a flock of birds moving around an object in flight.