Methodologically rigorous long-term study: Time spent using social media does not affect adolescent mental health. https://www.sciencedirect.com/science/article/pii/S0747563219303723 …pic.twitter.com/FBUUPhO1Xs
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The correlations on the population level are from observational data, mostly cross sectional. Like in nutrition research, those often yield illusory links, created by confounding factors.