The relevant question is pretty far down the page, here's the money quote:<p>>The stuff she found that goes viral is either stuff that is telling a truth that seemed hidden in some way, is really informative and someone might not have heard of before, or is really amazing and shocking. What doesn’t go viral: anything ambiguous, anything that doesn’t tell a really direct story, that’s not easily transmissible. I think the kind of history that does well on the web is the stuff that’s really unambiguous.