While you’re not likely to run into eating disorder-related content if you aren’t actively searching for it, there remain pockets of ED communities on the most popular platforms.
A subset of these groups actively encourages people to worsen their condition, teaching them tips and tricks on how to drop to dangerously low weights.
MyProAna (MPA) was once one of the largest and most popular eating disorder communities on the internet. In its heyday, it was a hub for sharing diet tips and weight loss progress.
These days, MyProAna goes by “Eating Disorder Support Forum”. It no longer calls itself a pro-anorexia community but a support community for people trying to recover from eating disorders.