Social media, as old as Cicero and as revolutionary as Christianity? Tom Standage and William Dutton join Philip Dodd to explore our networked world and to question whether social media alters historic mappings of power and authority. Photographer Dayanita Singh discusses her new retrospective at London’s Hayward gallery and her approach to the camera. As part of Verdi 200, Radio 3’s season celebrating the composer’s bicentenary, music historian Sarah Lenton and scholar René Weis explore Verdi’s passion for Shakespeare.