Can you tell if you live in a bubble?

It’s often said that we get trapped in online "filter bubbles” or “echo chambers” and that we don't get exposed to information that could challenge or broaden our worldview. It’s a convincing narrative - but is it true? And how do you know if you live in one? BBC Media Editor Amol Rajan has been finding out for a series called Crossing Divides.Producer: Duncan Barber. Editor: John Shields. Mixed by Nico Raufast.