Eating disorders (ED) and non-suicidal self-injury (NSSI) present common aspects and factors which contribute to their onset and development. The last decade has seen an increasing circulation of online materials and interactions connected to ED and NSSI. There is a general agreement among mental health clinicians and researchers that this kind of online content involves serious risks, such as normalization and reinforcement of unhealthy behaviors, alongside with some benefits, like receiving peer support and validation. The aim of this paper is to offer an overview of major research contributions on this topic. After describing common aspects between these disorders, we analyze data concerning the usage of harm-advocating websites on internet and the characteristics of users. Furthermore, we define and explore the contents of both pro-ED and NSSI websites, and we extensively inspect risks and benefits of the exposure to these online content. Finally, we present clinical guidelines for assessment, intervention and prevention, particularly focusing on family interventions. Due to the rapidity of changes when technology is involved, the research on this topic is far from being concluded; more in-depth studies are needed, not only to explore long term effects of the use of the websites described, but also to investigate new alarming tendencies such as the diffusion of websites challenging self-destructive behaviors.
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