Starting anything is a roller coaster with the highest highs and lowest lows.

We get to design what we want to see in the world rather than doing what other people think should be done.

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.

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.

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.

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

The greatest lesson that I learned in all of this is that you have to start. Start now, start here, and start small. Keep it Simple.