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Google quietly announced on Google+ and Twitter that they have added two new insights cards to the AdWords overview page that shares when your ad impressions shift significantly from one device to another, and when your ad impressions change notably from above or below the search results.
Here is what they look like:
The first one shows you how your add impressions change from device type and the second one shows you how those ad impressions shift from above or below the organic search results.
