Twitter was around communication and visualizing what was happening in the world in real-time. Square was allowing everyone to accept the form of payment people have in their pocket today, which is a credit card.

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.

Starting anything is a roller coaster with the highest highs and lowest lows.

The idea of Twitter started with me working in dispatch since I was 15 years old, where taxi cabs or firetrucks would broadcast where they were and what they were doing.

Everyone has an idea, but it's really about executing the idea and attracting other people to help you with the idea.

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.

We get to design what we want to see in the world rather than doing what other people think should be done.