I was fascinated with jeans, because you can impress your life upon the jeans you wear. The way you sit imprints on the jeans.

Twitter has been my life's work in many senses. It started with a fascination with cities and how they work, and what's going on in them right now.

I think that great programming is not all that dissimilar to great art. Once you start thinking in concepts of programming it makes you a better person...as does learning a foreign language, as does learning math, as does learning how to read.

Twitter is the world.

A number of people in the United States, almost everyone, is using plastic cards to pay for things, but it's extremely difficult to accept these cards. So let's make it's easy and take more and more of the friction out as we can.

Build what you want to see in the world.

I'm less interested in how people are following each other and more interested in how they are following topics and tweets themselves. People are following more key words and concepts and more ideas and acting on those rather than individuals or organizations.