Books allow you to fully explore a topic and immerse yourself in a deeper way than most media today. I'm looking forward to shifting more of my media diet towards reading books.

People have really gotten comfortable not only sharing more information and different kinds, but more openly and with more people - and that social norm is just something that has evolved over time.

Look at the way celebrities and politicians are using Facebook already. When Ashton Kutcher posts a video, he gets hundreds of pieces of feedback. Maybe he doesn't have time to read them all or respond to them all, but he's getting good feedback and getting a good sense of how people are thinking about that and maybe can respond to some of it.

Every application will be designed from the ground up to use real identity and friends.

Having two identities for yourself is an example of a lack of integrity.

We've changed our internal motto from "Move fast and break things" to "Move fast with stable infrastructure."

Move fast and break things. Unless you are breaking stuff, you are not moving fast enough.