What really motivates people at Facebook is building stuff that they're proud of.

Building a mission and building a business go hand in hand.

The real question for me is, do people have the tools that they need in order to make those decisions well? And I think that it's actually really important that Facebook continually makes it easier and easier to make those decisions... If people feel like they don't have control over how they're sharing things, then we're failing them.

Berlin definitely has one of the most vibrant of the startup scenes that I have seen. Not really just across Europe, but across the whole world in terms of cities. It's an interesting dynamic.

So many businesses get worried about looking like they might make a mistake, they become afraid to take any risk.

You grow more when you get more people's perspective.

Move fast, take risks, it's okay to try big things you're better off trying something and having it not work and learning from that than having not done anything at all.