"Keep girls' social media use under one hour daily Analyzing the 2022 PISA dataset covering 15- and 16-year-olds in 30-plus countries, Twenge found that for girls, those spending less than an hour a day on social media reported the highest average life satisfaction, while heavy users — five or more hours a day — were 49% more likely worldwide to report low life satisfaction. She notes, "The mean life satisfaction is a little lower for the non-users of social media," suggesting zero use isn't the goal, but keeping use light — under an hour — appears to be the sweet spot. Parents and teens can use this as a concrete daily ceiling rather than a vague "use less" nudge. Source: Jean Twenge, The Happiness Lab, Social Media and Teen Mental Health"