Google: Ok, so about half of our online ads are never actually seen

Google has now acknowledged that more than half of its ads are not on the screen for even one second. Google this week released an infographic, “Five Factors of Viewability,” showing that “many display ads that are served never actually have the opportunity to be seen by a user.”
The exact figure: 56.1 percent of all ads the Google and DoubleClick display ad platforms served. comScore has separately estimated that 46 percent of ads are not seen. Google uses the Media Rating Council’s definition that an ad is viewable “when 50 percent of an ad’s pixels are in view on the screen for a minimum of one second.”
Some of the reasons given for non-viewability: a user scrolled right past it, it wasn’t delivered, or it was delivered but the “viewer” was a software bot. Below-the-fold ads, which require most users to scroll down to view, are expected to have lower viewabilities, and 60 percent of ads below-the-fold are not seen.
But Google also notes that 32 percent of above-the-fold ads are not viewed, either. The most viewable position: right above the fold. The average publisher’s visibility is 50.2 percent, Google said, so some publishers are serving more non-viewables than others for some reason.