Following the teams inside Facebook, revealing a hidden technological playground. The film tackles difficult questions, like how our data is used, and also shows how Facebook works.

As Facebook heads for its 100 billion dollar flotation, Emily Maitlis updates her recent documentary on the prospects for Mark Zuckerberg's social network phenomenon.

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.