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

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.

There's an entire universe in every single tweet, and it all really depends on the content as far as how it's going to spread.

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.

A location-aware tablet will let us use what's called geodesign to compose participatory, what-if scenarios onsite, using maps that several people can share - something we could always do with paper but that's been a challenge with digital maps in the field.

You can't regulate what these kids are being exposed to on the Internet. It's so way out of control. All you can do is just try to talk to your own kids.

Republicans want to keep the open Internet safe from big government. Democrats want to keep it safe from big corporations. I say we agree to agree and move ahead.

Gold has worked for thousands of years, but now with the Internet, it works even better.