Auditing Methodology to Asses the Quality of Online Display Advertising Campaigns
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The reported lack of transparency of the online advertising market may seriously affect the interests of advertisers. In this paper, we present a novel methodology that allows advertisers to independently assess the quality of display advertising campaigns. This methodology also serves to audit the accuracy and completeness of reports delivered by the vendor responsible for running a campaign. We have applied our methodology in 8 display ad campaigns configured in Google AdWords, which overall produced 160K ad impressions displayed in more than 7K publishers. Our results reveal that AdWords seems to provide incomplete information to advertisers. In the case of our campaigns we found that: (i) AdWords did not report 57% of publishers where ad impressions from our campaigns were delivered, (ii) AdWords reports a significantly larger fraction of impressions delivered to contextually meaningful publishers than our auditing methodology (iii) higher CPM investment does not provide guarantees to get impressions delivered to more popular publishers, (iv) AdWords does not offer default control of frequency cap (i.e., the number of impressions of the same ad delivered to a user), (v) around 10% ad impressions delivered in two of the ad campaigns were related to fraud. These findings should contribute to open a debate between advertisers and Ad Tech vendors to standardize the utilization of independent auditing methodologies as the one presented in this work.