Rates of depression and anxiety have risen among teens over the last decade. Amid this ongoing mental health crisis, the American Psychological Association issued guidelines for parents to increase protection for teens online. In this encore episode, NPR science correspondent Michaeleen Doucleff looks into the data on how that change has impacted the mental health of teenagers. In her reporting, she found that the seismic shift of smartphones and social media has re-defined how teens socialize, communicate and even sleep. In 2009, about half of teens said they were using social media daily, reported psychologist Jean Twenge. And by 2022, 95% of teens said they used some social media, and about a third said they use it constantly.

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