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.

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

From a product standpoint, we want every touch point to feel magical. It inspires trust.

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

The interesting products out on the Internet today are not building new technologies. They're combining technologies. Instagram, for instance: Photos plus geolocation plus filters. Foursquare: restaurant reviews plus check-ins plus geo.

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

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