Social giants label Trump’s posts

Facebook and Twitter warn President Trump’s post-election remarks may be misleading. Plus, what a verbal battle between chatbots tells us about machine learning. And the plan to beam 5G connectivity from hydrogen-powered drones. Presented by Rory Cellan-Jones, with BBC reporters Jane Wakefield and Marianna Spring. Produced by Jat Gill. (Image: U.S. President Donald Trump speaks to reporters about the 2020 presidential election at the White House in Washington DC, Credit: Carlos Barria/ Reuters).