From the same Zuckerberg IPO letter: “The Hacker Way is an approach to building that involves continuous improvement and iteration. Hackers believe that something can always be better, and that nothing is ever complete. They just have to go fix it — often in the face of people who say it’s impossible or are content with the status quo.
“Hackers try to build the best services over the long term by quickly releasing and learning from smaller iterations rather than trying to get everything right all at once…We have the words ‘Done is better than perfect’ painted on our walls to remind ourselves to always keep shipping.”