New research: Smart phones and teenage depression

The push for a ban on social media for under-16s has been paused despite both National and Labour supporting it. Several other countries are moving to restrict young people's access to social media, following Australia's lead. Meanwhile, new research shows children who spend more than three hours a day on social media are more likely to develop depression and anxiety as teenagers. Dr Chen Shen from Imperial College's School of Public Health manages this large-scale Study of Cognition in Adolescents and Mobile Phones (SCAMP) and joins Susie Ferguson from London.