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.

We hired a CSR person at Twitter, years before we hired our first sales person, to make sure we had a culture and impact of doing good.

Even the simplest tools can empower people to do great things.

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

When you think of a social network, you have these two-way interactions: "Are you my friend? Yes? No? Yes?" Like LinkedIn, it's business oriented, but it's all about establishing connections. You connect to me through my other connections, and that sort of thing, and you sort of define who your friends are. Twitter doesn't have that.

In any leadership position, you're always going to be disappointing somebody.