My goal is to simplify complexity. I just want to build stuff that really simplifies our base human interaction.

Don't avoid eye contact and don't be late

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

Pick a movement, pick a revolution and join it.

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.

Success is never accidental.