What Facebook Knows About You

Facebook knows more about us than any other company in history. But we know very little about how Facebook works or what it does with our personal information. The company created by Mark Zuckerberg to connect people and share information is a secretive black box. Facebook is fighting to protect its own privacy even as it extends its reach into every corner of our lives in every corner of the globe. It faces two major court cases, which threaten to reveal how it works and what it does with our information. Reporter Darragh MacIntyre unravels the truth about Facebook.