Previous correlational research indicates that adolescent girls who use social network sites more frequently are more dissatisfied with their bodies. However, we know little about the causal direction of this relationship, the mechanisms underlying this relationship, and whether this relationship also occurs among boys to the same extent. The present two-wave panel study (18 month time lag) among 604 Dutch adolescents (aged 11–18; 50.7 % female; 97.7 % native Dutch) aimed to fill these gaps in knowledge. Structural equation modeling showed that social network site use predicted increased body dissatisfaction and increased peer influence on body image in the form of receiving peer appearance-related feedback. Peer appearance-related feedback did not predict body dissatisfaction and thus did not mediate the effect of social network site use on body dissatisfaction. Gender did not moderate the findings. Hence, social network sites can play an adverse role in the body image of both adolescent boys and girls.

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Although adolescents frequently use social network sites, little is known about whether the highly visual and self-presentation-centered character of such sites affects body-related outcomes such as investment in appearance and appearance-changing strategies. Due to gender differences in appearance pressures and appearance ideals, these effects of social network sites on body-related outcomes may differ between boys and girls. The aim of the current study was therefore to investigate the relationships between social network site use, appearance investment, and desire for cosmetic surgery among adolescents and to compare the experiences of boys and girls. We used data from a two-wave panel study among 604 Dutch adolescents (aged 11-18). Structural equation modeling showed that social network site use positively predicted adolescents' desire to undergo cosmetic surgery indirectly through increased appearance investment. The relationships found between social network site use, investment in appearance, and cosmetic surgery desire applied to boys and girls and were not moderated by gender.

Previous research has shown that adolescents´ social media use predicts increased body dissatisfaction. However, little is known about social environmental factors that may attenuate this relationship. This study examines one such potential moderating social environmental factor: positive parent–adolescent relationships. A school-based survey was conducted among 440 adolescents aged 12 to 19 ( M = 14.9, SD = 1.8, 47% female). On average, social media use was positively associated with body dissatisfaction, but this relationship was weaker among adolescents who reported a more positive mother–adolescent relationship. Positive father–adolescent relationship did not moderate the association between social media use and body dissatisfaction. These findings may indicate that adolescents’ social environment, notably the relationship they have with their mothers, can protect them against the detrimental effects of social media use on body dissatisfaction. However, longitudinal and experimental studies are needed to examine the direction of effects and test the validity of this interpretation.

The present meta-analysis reviews English-language studies from 2005 to 2016 to investigate the relationship between social networking sites (SNSs) usage and mental health and to explore whether cultural background, measurement of usage, gender and age influence this relationship. A total of 63 studies and 144 effect sizes (positive indicators of mental health k = 62, negative indicators of mental health k = 82) were analyzed. We found that (1) SNSs usage was positively correlated with both positive and negative indicators of mental health, and no significant difference between these two mean correlations was found; (2) age did not moderate the relationship between SNSs usage and mental health; (3) SNSs usage was positively related to positive indicators for measures of social network size, while general use was positively related to negative indicators; (4) stronger correlations were found between SNSs usage and positive indicators of mental health in collectivist cultures than in individualistic cultures; (5) as percentage of female participants increased, a stronger relationship between social network sites and negative indicators of mental health was observed. This meta-analysis allows for integration of conclusions of past studies and establishes a clearer understanding of the relations between SNSs usage and mental health, including recognizing that complex factors (such as cultural background and gender) moderate these relations.

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Individuals with high levels of externally contingent self-worth tend to base their self-esteem on factors such as appearance, competitive success, and others' approval. Such tendencies might also elevate people's focus on material possessions. However, cultural moderation of these associations has yet to be explored. A cross-cultural survey among Chinese and Dutch college students examined the link between externally-based contingent self-worth and materialistic values, as well as the mediating roles of need to belong and need for self-enhancement. An initial multi-group path analysis indicated a stronger link between externally contingent self-worth and materialism for Chinese students than for Dutch students. For both Chinese and Dutch students, externally contingent self-worth was positively related to materialistic values, need to belong, and need for selfenhancement. Need to belong and need for self-enhancement were positively linked with materialism, and need to belong and need for self-enhancement mediated the link between externally contingent self-worth and materialism. Though the indirect effect via selfenhancement was somewhat stronger among Chinese participants, this research demonstrates that people's externally contingent selfworth might be a factor predicting materialism across cultures, with need to belong and need for self-enhancement playing similar roles as underlying processes in different societies.