Users with experience of eating disorders use the internet as a source of information, whether for prorecovery activities (such as web-based treatment, looking for information, support, and sharing) or activities that promote eating disorder behavior as a desirable lifestyle choice (such as pro-eating disorder communities and reading and creating pro-eating disorder posts). Their assessment of web-based eating disorder-related information is crucial for understanding the context of the illness and for health professionals and their web-based interventions.