Facebook: Cracking the Code

"What's on your mind?" It's the friendly Facebook question which lets you share your story. It's also the question that unlocks the details of your life and helps turn your thoughts into profits. From tracking your browsing data to fake news and targeted ads, Four Corners explores the world of Facebook and how we are being exploited to drive the huge success and influence of the social media giant - even if you don't have a Facebook page at all.