AD FAIL: StumbleUpon Ads on Digg: "It gets better: StumbleUpon isn’t looking for users, but rather promoting StumbleUpon Advertising. StumbleUpon stealing advertisers from Digg using Digg Ads? Amusing, but not necessarily intentional: StumbleUpon could have made an ad buy across a number of sites. Regardless, it’s time to enable the competitive ad filter, Digg!"