After a peaceful vigil in Southport for three young girls killed during a knife attack on Monday, violent protests erupted in which dozens of police officers were injured. The local Police and Crime Commissioner said the rioters were apparently drawn by online rumours about who was behind the attack - none of which have been proven. We discuss the threat of misinformation on social media to politics and democracy, with Bloomberg reporter Daniel Zuidijk. Hosted by Lizzy Burden and Stephen Carroll.