The British government has launched a nationwide consultation on children's use of social media and mobile phones amid growing concerns that excessive screen time is undermining young people's mental health, learning and social development.The move signals a new phase in Britain's approach to regulating the digital environment for children, as policymakers face growing pressure from parents, schools and lawmakers to curb the expanding influence of social media and smartphones on daily life.Backed by a national public discussion, the consultation will gather views from parents, young people and civil society on how to ensure children develop a healthier relationship with technology,...