You don't have to start from scratch to have a massive impact on the world.

The Web provides a very easy way to immediately grasp what's going on. It really offers the transparency, so you can see, especially with the search engine, how people are using Twitter at one glance. The phone doesn't allow for that.

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.

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

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

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