In all, KFC gave away 4 million meals in two days. That sounds like a lot, but it pales in comparison to the 4 million pieces of grilled chicken it doled out April 27 alone when it declared a national “Unfry Day” in ads”

Plus Zeta Group showed that total positive buzz from blogs dropped from 72% to 67%

According to Zeta Interactive, which monitors blog chatter, KFC generally popped up in about 538 blog posts daily, with 72% of mentions positive. During the promotion, that number soared to 1,319 mentions, 89% of which were positive. But cutting the cord on Thursday had an immediate effect, with 772 posts. Negative ratings shot up, to 33%.”

Again, the velocity of response is mind-numbingly quick, and amplified by blogs, Facebook, Twitter and the like in impacting the brand and “success” measures of the campaign. That the campaign design was flawed, particularly the coupon implementation, is nicely covered here.