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

I said a long time ago that Foursquare can make cities better. You have these augmented realities like Foursquare and Twitter and Facebook that provide these virtual nodes and instant feedback from anywhere, adding annotation around a physical places.

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.

'Luck' is recognizing when the situation encourages build out and execution.

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.

Short term satisfaction will never lead to something timeless.

Make every detail perfect and limit the number of details to perfect.