Instagram is an image-sharing social networking service (SNS) particularly enjoyed by young adults. It excessive and problematic use impacts users' body image (BI). Individuals with negative BI feel dissatisfied with their appearance and body, and perceive a discrepancy between their current and ideal image. Instagram, in contrast to other SNS, focused uniquely on image-based content. As such, it is likely that Instagram differs from other social media in term of mediating processes linking its use to BI, reflecting the need to understanding the relationship between maladaptive Instagram use and body dissatisfaction. The main purpose of this study is to investigate, through a self-determination theory (SDT) framework, the mediating role of basic psychological needs (BPN) satisfaction/frustration and needs-supportive/needs-thwarting interpersonal behaviors on the relationship between maladaptive Instagram use and body dissatisfaction. The results showed the role of BPN satisfaction/frustration (autonomy, competence and relatedness) in the relationship between maladaptive Instagram use and body dissatisfaction. The sample comprised 525 young adults from several Italian university. This study extends the knowledge of the factors that can be related to the BI of young adults, with important application implications.
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