Meet customers where they are; question how to make the tools customers use more valuable.

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

I think Twitter is the future of communications and Square will be the payment network.

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.

What's interesting about Twitter and the influencers that someone follows - like, say, Shaquille O'Neal - is that they see someone who is using the exact same tools that they have access to, and I think that inspires this hope to be able to really engage with someone like him.

Great companies don't just have one founding moment. They have many founding moments.

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