I spend 90% of my time with people who don't report to me, which also allows for serendipity, since I'm walking around the office all the time. You don't have to schedule serendipity. It just happens.

All my days are themed. Monday is managementTuesday is product, engineering, and design. Wednesday is marketing, growth, and communications. Thursday is partnership and developers. Friday is company and cultureOn the days beginning with T, I start at Twitter in the morning, then go to Square in the afternoon. Sundays are for strategySaturday is a day off.

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.

I'm less interested in how people are following each other and more interested in how they are following topics and tweets themselves. People are following more key words and concepts and more ideas and acting on those rather than individuals or organizations.

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

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.

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.