In the book “The Anxious Generation,” Jonathan Haidt, a social psychologist at New York University, argues that social-media platforms are detrimental to youths’ well-being, and that society needs to treat them as literally addictive. It has spent nearly a hundred weeks on the New York Times best-seller list, and has helped galvanize a movement seeking limits to social media in legislatures, in school districts, and in the courts. David Remnick speaks with Haidt about an Australian law to verify the age of social-media users, the first of its kind in the world, and about lawsuits in California that are aiming to pin liability for harms on social-media companies themselves. 

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