Are smartphones really making our children sad?

US psychologist Jean Twenge, who has claimed that social media is having a malign affect on the young, answers critics who accuse her of crying wolfLast week, the children’s commissioner, Anne Longfield, launched a campaign to help parents regulate internet and smartphone use at home. She suggested that the overconsumption of social media was a problem akin to that of junk-food diets. “None of us, as parents, would want our children to eat junk food all the time – double cheese