Sixteen Miles Out/Unsplash As the United Kingdom and other countries make moves to follow Australia’s lead in restricting access to social media for under 16s, there is still much we don’t know about how the technology impacts young people’s mental health over time. For example, does using social media for a certain amount of hours each day lead to increased harm? Are younger adolescents more vulnerable than older ones? Is there any difference between boys and girls? Our new study, published t