Current affairs programme. Darragh MacIntyre investigates Facebook and questions whether the company's size and complexity now makes it impossible to regulate.

Facebook is thought to know more about us than any other business in history, but what does the social network that Mark Zuckerberg built do with all of our personal information?

Reporter Darragh MacIntyre investigates how Facebook's powerful algorithms allow advertisers and politicians to target us more directly than ever before, and he questions whether the company's size and complexity now makes it impossible to regulate.