There are two ways to extend a business. Take inventory of what you're good at and extend out from your skills. Or determine what your customers need and work backward, even if it requires learning new skills. Kindle is an example of working backward.

We go from Product 1.0 to Product 2.0 a lot faster. This is a powerful unlock. We've always said that our people make the difference. We're certainly seeing that today.

I mean, we've built a lot of products that we think are good, and will help people share photos and share videos and write messages to each other. But it's really all about how people are spreading Facebook around the world in all these different countries. And that's what's so amazing about the scale that it's at today.

The "Be good" concept also comes up when we design our products. We want them to have positive social effects.

The community - more than two billion people use our products, and we get that, with that, a lot of people are using that for a lot of good, but we also have a responsibility to mitigate the darker things that people are gonna try to do.

I am saddened, not by Microsoft's success - I have no problem with their success. They've earned their success, for the most part. I have a problem with the fact that they just make really third-rate products.