At Twitter, mobile is in our DNA ... For us, it's all about mobile, and it always has been.

What if the New York Times gave out free, cheap Kindles to everyone and said this is how we're doing it now. You know? Maybe that's a way to go. The technology gets cheaper and cheaper, and at some point it has to be cheaper than all these trucks and all this gas, to just say, let's give away a Kindle to everyone.

People are watching TV, they're watching some clips on their iPhone. I mean, some folks are sitting there on the iPhone, watching the Colbert Report, and meanwhile there's a huge plasma TV right in front of them that they could be watching it on.

We did Twitter, and Twitter grew so fast, and in 2006 we spun it out into Twitter, Inc.

Positive culture comes from being mindful, and respecting your coworkers, and being empathetic.

Constraint inspires creativity

I thought I was going to stay at Google, because it was a great place to work.