Over 2 1/2 years ago, I wrote about how ad rotation works in AdWords. Since then, a whole lot has changed. Most recently, we’ve simplified the options for ad rotation. Let’s take a closer look at how ad rotation works now and what that means for ad testing. How AdWords picks which ads to show […]
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source http://www.onpageseochecker.com/googles-all-new-quite-counterintuitive-guide-to-ad-testing/
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