The most innovative companies allow their employees the freedom to develop their interests and to take risks. Facebook has an interview process that only selects employees who are the right fit for the company's culture. Once they are in, they take part in intensive training that teaches them the "hacker way" of fast, creative coding that Zuckerberg prizes.
They are also allowed to work on the projects that they are most interested in vs. those that are assigned to them. Companies like Facebook, Apple and Zappos have created a culture that empowers courage of conviction, freedom of speech, and action. This comes from strong leadership that leads by example.
"I think as a company, if you can get those two things right--having a clear direction on what you are trying to do and bringing in great people who can execute on the stuff--then you can do pretty well." --Mark Zuckerberg