Adolescents are spending considerable time on social media, yet it is unclear whether motivations for social media use drive different forms of social media engagement, and their relationships with body satisfaction and well-being. This study tested a proposed model of the relationships between motivations for social media use, types of social media engagement and body satisfaction and well-being. Responses to an online survey from 1432 Australian adolescents (M_age = 13.45 years, SD = 1.14, range 11–17; 55.4% boys) were collected. Structural equational modelling indicates excellent model fit. Specifically, motivations for social media use (information sharing, passing time, escapism, social interaction, social capital and appearance feedback) were associated with engagement (intensity, photo-based use, active use, passive use and liking use) and revealed mixed associations with body satisfaction and well-being. The findings support the importance of considering motivations for social media use in future research.

青少年在社交媒体上花费了大量时间，但尚不清楚社交媒体使用的动机是否会推动不同形式的社交媒体参与，以及他们与身体满意度和幸福感的关系。本研究测试了社交媒体使用动机、社交媒体参与类型以及身体满意度和幸福感之间关系的拟议模型。对 1432 名澳大利亚青少年（M_岁）的在线调查的回应 = 13.45 岁，SD = 1.14，范围 11-17；55.4% 男孩）被收集。结构方程建模表明模型拟合良好。具体而言，社交媒体使用的动机（信息共享、消磨时间、逃避现实、社交互动、社交资本和外表反馈）与参与（强度、基于照片的使用、主动使用、被动使用和喜欢使用）相关，并显示出混合关联身体满意和幸福。研究结果支持在未来研究中考虑社交媒体使用动机的重要性。