Ian Sample talks to Dr Amy Orben, who leads the digital mental health programme at the Medical Research Council’s cognition and brain sciences unit, about why the link between teen mental health and social media is so difficult to study, what the current evidence tells us and what advice she gives to parents whose children are entering the online world for the first time. Help support our independent journalism at <a href="https://www.theguardian.com/sciencepod">theguardian.com/sciencepod</a>
