> Big ad buyers throw stuff at the wall to see what sticks, and they rarely bother truly measuring because that's often impossible. > The entire ad industry is

> Big ad buyers throw stuff at the wall to see what sticks, and they rarely bother truly measuring because that's often impossible. > The entire ad industry is based on fuzzy metrics. Within that fuzz is an awful lot of room for fraud. Citation needed. Do you have any hard data besides anecdotes and contrived examples?