When I was a teen I frequented a lot of pro-ana sites, most notably a
Xanga and Livejournals groups and blogs. A lot of the girls I knew on the sites, myself included, tended to have EDNOS(Eating Disorder Not Otherwise Specified, although I think it’s called something else now) rather than Anorexia, though it’s still disordered eating.
The way that some teenagers, especially girls, thrive on the culture of Tumblr really does remind me of my days on Livejournal and Xanga.