Here's an interview I did with Facebook founder Mark Zuckerberg at Startup School the other weekend. One of the most interesting things to me was his analysis of what The Social Network
got wrong. People in Hollywood couldn't imagine that someone would build something because they were interested in building things, so they had to create another, perhaps more "movie-compatible," motivation for him.
This is is one of the biggest things the rest of the world doesn't understand about hackers. They simply enjoy building things. A lot of successful startups began as things done just for fun or out of curiosity.
Check out the full interview (which includes some questions about Facebook's early days) and all the other talks from Startup School here: http://www.justin.tv/startupschool/videos