Purpose This study examined (1) whether intense and problematic social media use (SMU) were independently associated with adolescent well-being; (2) whether these associations varied by the country-level prevalence of intense and problematic SMU; and (3) whether differences in the country-level prevalence of intense and problematic SMU were related to differences in mobile Internet access. Methods Individual-level data came from 154,981 adolescents (mean age = 13.5) from 29 countries that participated in the 2017/2018 Health Behaviour in School-aged Children (HBSC) survey. Intense SMU was measured by the time spent on social media, whereas problematic SMU was defined by symptoms of addiction to social media. Mental (life satisfaction and psychological complaints), school (school satisfaction and perceived school pressure), and social (family support and friend support) well-being were assessed. Country-level data came from aggregated individual-level data and data from the Organisation for Economic Co-operation and Development (OECD) on Internet access. Results Two-level regression analyses indicated that in countries with a lower prevalence of intense SMU, intense users reported lower levels of life satisfaction and family support and more psychological complaints than nonintense users. In contrast, in countries with a higher prevalence of intense SMU, intense users reported higher levels of family support and life satisfaction than nonintense users, and similar levels of psychological complaints. In all countries, intense users reported more friend support than nonintense users. The findings regarding problematic SMU were more consistent: In all countries, problematic users reported lower well-being on all domains than nonproblematic users. Observed differences in country-level prevalence rates of intense and problematic SMU could not be explained by mobile Internet access. Conclusions Adolescents reporting problematic SMU are particularly at risk of lower well-being. In many countries, intense SMU may be a normative adolescent behavior that contributes positively to specific domains of their well-being.

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Cross‐sectional research shows that adolescents’ social media use (SMU) and attention deficit hyperactivity disorder (ADHD)‐symptoms are related, but it is unclear whether this relation is explained by SMU intensity or by addiction‐like SMU problems. Also, due to the lack of longitudinal studies, the direction of this relation remains unknown. This study aims to disentangle which type of SMU is related to ADHD‐symptoms, and in which direction, using a three‐wave longitudinal study among Dutch adolescents aged 11–15 years ( n = 543). Findings suggest a unidirectional relation: SMU problems increased ADHD‐symptoms over time, SMU intensity did not. This implies that problematic use, rather than the intensity of use harmfully affects adolescents’ ADHD‐symptoms.

Background and aims There is currently no cross‐national validation of a scale that measures problematic social media use (SMU). The present study investigated and compared the psychometric properties of the social media disorder (SMD) scale among young adolescents from different countries. Design Validation study. Setting and participants Data came from 222 532 adolescents from 44 countries participating in the health behaviour in school‐aged children (HBSC) survey (2017/2018). The HBSC survey was conducted in the European region and Canada. Participants were on average aged 13.54 years (standard deviation = 1.63) and 51.24% were girls. Measurement Problematic SMU was measured using the nine‐item SMD scale with dichotomous response options. Findings Confirmatory factor analyses (CFA) showed good model fit for a one‐factor model across all countries (minimum comparative fit index (CFI) and Tucker–Lewis index (TLI) = 0.963 and 0.951, maximum root mean square error of approximation (RMSEA) and standardized root mean square residual (SRMR) = 0.057 and 0.060), confirming structural validity. The internal consistency of the items was adequate in all countries (minimum alpha = 0.840), indicating that the scale provides reliable scores. Multi‐group CFA showed that the factor structure was measurement invariant across countries (ΔCFI = −0.010, ΔRMSEA = 0.003), suggesting that adolescents’ level of problematic SMU can be reliably compared cross‐nationally. In all countries, gender and socio‐economic invariance was established, and age invariance was found in 43 of 44 countries. In line with prior research, in almost all countries, problematic SMU related to poorer mental wellbeing (range βSTDY = 0.193–0.924, P < 0.05) and higher intensity of online communication (range βSTDY = 0.163–0.635, P < 0.05), confirming appropriate criterion validity. Conclusions The social media disorder scale appears to be suitable for measuring and comparing problematic social media use among young adolescents across many national contexts.