To the Editor Riehm et al1 report an association between social media use and increased risk of internalizing and combined internalizing/externalizing problems 1 year later (between waves 2 and 3 of Population Assessment of Tobacco and Health study data), controlling for psychopathology and alcohol/marijuana use at wave 1. However, the analytic strategy is vulnerable to substantial residual confounding.
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Keyes KM, Kreski N. Is There an Association Between Social Media Use and Mental Health? The Timing of Confounding Measurement Matters. JAMA Psychiatry. 2020;77(4):437. doi:10.1001/jamapsychiatry.2019.4499
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