"The fun is in always building something. After it's built, you play with it awhile and then you're through. You see, we never do the same thing twice around here. We're always opening up new doors."

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We used to write this down by saying, 'move fast and break things.' And the idea was, unless you are breaking some stuff you are not moving fast enough. I think there's probably something in that for other entrepreneurs to learn which is that making mistakes is okay. At the end of the day, the goal of building something is to build something, not to not make mistakes.

— Mark Zuckerberg