If there is a bug in your code than you have to drop everything you're doing and go fix it.

Almost any mistake you can make in running a company, I've probably made

It's tough to say, exactly, what things will look like in three to five years, but there's a lot of work to do in just moving along the path that we've already set out.

Berlin is one of my favorite cities in the world. I feel like the energy is very youthful. It has such an important history, including its recent history of unification.

It occurred to me that building a company was the best way to align a group of people towards building something great. And its really... it's a good organizational structure where you can really reward people. If they're building something that's good, you can you work with partners and reward them if the product that you're developing work well. It's a good way to get the best people involved to build something very good.

People developed planes first and then took care of flight safety. If people were focused on safety first, no one would ever have built a plane.

We want Facebook to be one of the best places people can go to learn how to build stuff.