Your job as an executive is to edit, not write. It's OK to write once in a while but if you do it often there's a fundamental problem with the team. Every time you do something ask if you're writing or editing and get in the mode of editing.

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

From a product standpoint, we want every touch point to feel magical. It inspires trust.

It's empowering to be asked to look at what's possible, not told how to do it.

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

Build what you want to see in the world.

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.