This sort of stuff furthers my resolve to give my kids dumbphones and PCs with no internet access until they're at least 14 or 15, with plenty of education beforehand. For example, at school we got taught about anorexia, body image and coping strategies in junior high. If they need to get online they can use the family PC in the living room that's in full view of everyone.

My observation is that what I can only call information operations on Tumblr are very similar in form to various groups retweeting divisive political memes on Twitter or other social media. Most likely it has been freelance individuals with some sort of sexual fetish, not an organization, but still. It's not normal user behavior to be constantly re-posting and mashing up memes all day long every day encouraging pre-teen girls to be anorexic.