Feb 16
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Posted by Dr-Pete For the past couple of months, Google has been testing SERPs with 4 ads at the top of the page (previously, the top ad block had 1-3 ads), leading to a ton of speculation in the PPC community. Across the MozCast data set, 4 ads accounted for only about 1% of SERPs with top ads (which matches testing protocol, historically)
Follow this link:
Four Ads on Top: The Wait Is Over