The article discusses the relationship between social media and teenage mental illness, with the author arguing that social media is a cause of the epidemic of teenage mental illness. The author presents evidence from various studies, including experimental and correlational studies, to support their claim. The author also responds to criticisms from skeptics, including psychologist Candice Odgers, who argue that the relationship between social media and mental illness is correlational, not causal. The author argues that the evidence suggests a clear and consistent signal of harm from social media use, particularly for girls and women.