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"The adCenter blog announced ongoing changes being made to how they score ad's relevancy and quality. The changes include:There's an expanded definition of relevancy, and a higher standard of relevancy required for extremely popular or 'trending now' keywords.\r\nIn the Landing Page and Site Quality section there\u2019s more detailed definitions\r\nIn the Landing Page and Site User Experience section, the following has been added as a scenario that may be considered a low-value user experience.\r\nIn the Marketplace Exclusion section there are two new/expanded definitions.\r\n\r\nThere are more details at the adCenter blog.I should note, there is a WebmasterWorld thread with complaints about his ad prices soaring recently.  He said:One by one this change is sweeping through my various AdCenter accounts... last month there was a change made to the broad matching algorithm that loosened match criteria. In our case, the volume of impressions shot up by 25% in two days and our CPA went straight to hell because the new traffic is irrelevant, untargeted bunk. I know from friends in other companies that we're not the only ones having this problem. Frankly I think a rollback and a refund are in order but who listens to me lol.Do you feel the same way? Let us know.Forum discussion at WebmasterWorld."^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.seroundtable.com/adcenter-quality-update-13950.html>