'Luck' is recognizing when the situation encourages build out and execution.

Constraints inspire us in how we approach the press, how we approach business relationships, how we do everything.

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.

Making something simple is very difficult.

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

Twitter is the world.

An idea that can change the course of the company can come from anywhere.