IM is interesting because you look at your buddy list and, at a glance, see what your friends are listening to, what they're working on, what they're doing. The problem was that you were bound to the computer keyboard.

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 I love about New York is just the electricity I feel right away.

As CEO, my main job is editor-in-chief.

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

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

Pick a movement, pick a revolution and join it.