An academic who created an app which harvested data from 50 million users says he has been made "a scapegoat" for Facebook and Cambridge Analytica. Also in the programme: People in the north-eastern Nigerian town of Dapchi are celebrating the return of most of the school girls kidnapped by Boko Haram militants last month; and we hear from a Palestinian doctor who saw three of his daughters killed when an Israeli tank attacked his home in Gaza - but who refuses to hate in their name. Picture: Logos of US online social media and social networking service Facebook. Credit: Getty Images/AFP.