First, a disclaimer about this experiment and the analysis.
In retrospect, this experiment was flawed. The subject matter and style of delivery was very clearly geared in favor of one of the combatants. When it was initially conceived, it was decided that the experiment would best be delivered through a post that announced itself. By checking traffic statistics on a post titled: “The StumbleUpon Digg Experiment”, there would be equal billing, equal exposure, and most importantly, equal chances through the delivery methods to give both sides a chance.