In just seven years, Mark Zuckerberg has gone from his Harvard college dorm to running a business with 800 million users, and a possible value of $100 billion.
His idea to make the world more open and connected has sparked a revolution in communication, and now looks set to have a huge impact on business too.
Emily Maitlis reports on life inside Facebook. Featuring a rare interview with Zuckerberg himself, the film tells the story of Facebook's creation, looks at the accuracy of The Social Network movie, and examines Facebook's plans to use the personal information it has collected to power a new kind of online advertising.
Watch the full documentary now