I have seen firsthand the damaging toll anorexia and bulimia can take on my students, both physically and emotionally. As much as I am against anorexia and bulimia, I believe discussion concerning shutting down 'pro-ana' websites becomes a slippery slope, and possibly a dangerous one.
It all depends on the context of the website and who is ordering the shutting down of the website. For example, the website is a student-controlled site found on the school district domain. Should the school district have the right in determining whether it should be shut down? Absolutely, and I believe that they should. If the school district controls the servers and domain rights, they should have the say-so in determining what kind of content is posted on school or student-controlled websites.
Another example is Facebook. Facebook has very publicly discontinued certain groups from having page rights on their website, if the company thought that the material or topic, like hate groups or gay-bashing, for example, was damaging, hateful, or racist. Again, the company in control of the domain made the decision to terminate the users' account and usage.
I am in favor of this type of control, for the specific company or school district or publisher, like a blog, to say, 'Look, we think your topic is unhealthy and does not really represent what we stand for, so we are cancelling your account.'
I am not in favor of the U.S. government attempting to pass laws or restrictions concerning what can or cannot be posted on the Internet; that quickly becomes very dangerous ground and sounds like an infringement of the first amendment. Individual companies, on the other hand, should certainly be able to control and limit the kind of material published on their sites, and in the case of 'pro ana' material, I hope that more companies will take a stronger stance in disavowing the spread of this very harmful lifestyle.