An idea that can change the course of the company can come from anywhere.

My mom cares that I tweeted a picture of my breakfast. She's knows I'm eating and I'm safe.

Anything you're interested in the world whether it be Charlie rose or JetBlue or a public figure or your local coffee shop, they're on Twitter and broadcasting what is interesting to them.

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.

Revolution looks at the intersection ahead and pushes people to do the right thing.

It's a matter of invitations versus context. Twitter is really good at providing context, like, I''m having coffee at Third Rail Coffee.' Foursquare is about invitations to places. In this respect Foursquare has started to replace Yelp for me.

The strongest thing you can cultivate as an entrepreneur is to not rely on luck but cultivating an ability to recognize fortunate situations when they are occurring.