Spend no more than 2 hours a day on digital media, psychology professor tells 'iGen'

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SAN DIEGO - San Diego State University psychology professor Jean Twenge sees smartphones and social media as raising an unhappy, compliant 'iGen'. She and a team of researchers from the university did a study of more than a million children aged 13 to 18 and found that unhappiness began to increase after more than an hour of screen time. However, the researchers advised against avoiding digital media completely, as this was also associated with unhappiness.