Actually, that's a very interesting example. It's one of the only iconic images that most people wouldn't actually recognize, because (like the Mogadishu images) media outlets believed it's newsvalue trumped the fact that it was so disturbing, and so chose to run it, but unlike those images, they almost all altered it in some fashion, cropping it or pixellating it, so that very few people saw the same version of the image. This article:

http://www.nieman.harvard.edu/report...71-74V58N2.pdf

includes a chart of which outlets showed which version of the image.