I think what most people fear, when it comes to getting down-and-dirty and REAL with their personal blogging, are the labels - and the inevitable stigmas attached to those labels. The world is doing very well in breaking down some of those stigmas, especially mental health; having major depression and/or anxiety is no longer "frowned upon" (at least not from my perspective and experience). However, the ones like "Addict", "Alcoholic", "Anorexic", "Suicide Survivor" etc., while requiring the greatest amount of balls to claim (which is often the first step in healthy recovery), are the ones that are most judged. And it's the judgement that most people avoid, hence online anonymity.