I don't like the way these people restrict the axes on their charts to make their data look more significant than it is (e.g. http://cdn.okcimg.com/blog/four_myths/women_smiling.png). I seem to recall that they did this in earlier posts too.
good point, but if they are trying to show a relative (percentage) difference, then their restricted axes make sense, right? perhaps they should be labeled with percentage differences as well as absolute diffs