Instagram head Adam Mosseri told a Los Angeles courtroom last week that a teenager’s 16-hour single-day session on the platform was “problematic use” but not an addiction, a distinction he drew repeatedly during testimony in a landmark trial over social media’s harm to minors.
Mosseri, who has led Instagram for eight years, is the first high-profile tech executive to take the stand. He agreed the platform should do everything in its power to protect young users but said how…

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