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Nerds probably have the AdBlock installed :)

• jeffreymcmanus 15y ago
  If nobody sees your ad, it costs you nothing. Whether the ad is effective or not is a function of whether you can convert a clickthrough.
  • huhtenberg 15y ago
    AdBlock in Chrome prevents ad images from being displayed, but they are still downloaded. This is different from FF where ads are blocked at the downloading stage. In other words the impression counter can easily go up without ads being actually seen.
    • jeffreymcmanus 15y ago
      That is why CPC advertising exists.