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Objectives: Preadolescent social media use is normative and could influence mental health. This study investigated: (a) Differences between preadolescent users and non-users of various social media platforms on mental health, (b) unique links between time spent on those platforms, appearance-based activities on social media, and mental health, and (c) the moderating role of biological sex on those relationships., Method: Preadolescent youth (N = 528; 50.9% male) completed online surveys., Results: Users of YouTube, Instagram, and Snapchat reported more body image concerns and eating pathology than non-users, but did not differ on depressive symptoms or social anxiety. Appearance investment uniquely predicted depressive symptoms. Appearance comparisons uniquely predicted all aspects of mental health, with some associations stronger for females than males., Conclusions: Preadolescents could be encouraged to reduce their opportunities to make appearance comparisons and to invest less in their appearance on social media. Preadolescents may benefit from social media intervention programs., (© 2020 Wiley Periodicals, Inc.)

Social anxiety is a common mental disorder with an average age of onset in early adolescence. Current theories focus largely on risk factors that are present from early in life, but reasons for onset of the disorder as youth move into adolescence are rarely discussed. We recently proposed a model of the onset of certain mental disorders during the adolescent years based on characteristics of adolescent development. While this model will require longitudinal testing, the current article establishes concurrent associations between relevant variables in a cohort of 528 preadolescents (M age = 11.2 years) at baseline. Youth with social anxiety disorder differed significantly from other youth on measures of social comparison (including physical appearance comparisons, self-rated attractiveness, and negative peer comparisons on social media) as well as positive peer connections (including self-reported school belonging, number of friends, victimization, and peer affiliation). A structural equation model showed that symptom levels of social anxiety were directly related to social comparisons and peer connections, as well as indirectly associated with pubertal development and social comparisons. This pattern was not moderated by sex of youth. [ABSTRACT FROM AUTHOR]

The aims of this study were to determine the impact of adolescent-relevant risk factors on changes in social anxiety symptoms from pre-to early-adolescence. From 2016 to 2018, 528 youth (51% boys) were tested in three annual waves across grades 6, 7, and 8 (M ages 11.2, 12.7, 13.7 years). Through online surveys youth reported on peer relationships that were combined into two latent factors: 1) appearance comparisons, comprising youth reports of appearance comparisons relative to others in general and while using social media, along with perceived attractiveness; and 2) positive peer connections, comprising youth reports of group affiliation, school belonging, and peer victimisation. Youth and their parents also reported on the youth's level of pubertal development as well as the youth's level of social anxiety using previously validated questionnaires. Social anxiety was also assessed with structured diagnostic interview. Separate cross-lagged panel models were used to model longitudinal associations between all risk factors and youth, parent, and interviewer-reported measures of social anxiety. Of the associations tested, only appearance comparisons directly predicted increases in social anxiety symptoms 12 months later across all models. More advanced pubertal development was associated with increased appearance comparisons the following year. On the other hand, higher levels of social anxiety predicted subsequent reductions in positive peer connections in parent and interviewer models. These results highlight the important and interconnected impact of pubertal development and appearance comparisons on both the development of social anxiety symptoms during early adolescence, as well as the social consequences of social anxiety. • Social anxiety disorder commonly begins during early adolescence. • Comparing one's appearance against others predicted social anxiety the following year. • More advanced pubertal development indirectly predicted social anxiety. • Poor peer connections did not predict future social anxiety. • However, higher levels of social anxiety predicted poorer peer connections. [ABSTRACT FROM AUTHOR]