Q&A with Mark Zuckerberg

In 2004, Mark Zuckerberg launched Facebook (FB) from his Harvard University dorm room, hoping to see what his classmates were up to on campus. The following eight years brought international fame, unimaginable wealth, a hit Hollywood movie, a disastrous initial public offering, a sagging stock price—and one unprecedented achievement. On Sept. 14, the company reached 1 billion active users.

It is amazing.