Im still very divided on this matter, but Ill post some of the reasons while I think Pro-Ana sites can be helpful.
I think the ideal of Pro-Ana, not what some use it as, is great. They offer helpful tips on how to be safer. They often encourage one not to purge, listing all the harmful things it does to your body. At the same time, they realise that people dont really choose to purge, so they offer up the safest way to do that, or rather, tell you what not to do.
Most anorexics, at least those I know, dont really like being anorexic, but they just arent ready to get better yet. I think a lot of problems lie in the fact that doctors tend to look at the physical part of anorexia (they just try to get them to eat) when the should be looking more at the mental part, preferably before things get bad enough that they need to be hospitalized, which brings up another problem. To actually be an anorexic, you have to make a weight requirement. How cruel is that? Im sorry Sally, I know you havent eaten in two weeks straight, and youve kept your diet under 500k calories a day for a almost a year now, except, of course, for all those times you binged, but youre just too fat. Maybe if you lose a little more weight I can treat you?
On the other hand, there are sites out there that basically teach you how to be an anorexic. They try to present it as a way to dieting, like you can just acquire a mental illness to lose those last few pounds. A site cant make a person anorexic, but these sites can be harmful to someone who already is.
A little random, but Im still trying to figure this out for myself.