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

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.

Amazing what people make up based on what they choose to see.

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.

I think Twitter is best when it sparks conversations elsewhere. To use YouTube and Facebook and all the tools we have available to us today to respond and also promote and answer and engage is awesome.

Build what you want to see in the world.

Making something simple is very difficult.