What are referrals coming from googleads.g.doubleclick.net?

Referrals from googleads.g.doubleclick.net are clicks on your AdWords ads being shown on the content network - specifically, ads showing on publisher sites in the AdSense programme - for which the Destination URLs have not been tagged.

If you have noticed googleads.g.doubleclick.net appearing in your reports, please check to see if auto-tagging is turned on in your AdWords account or that your own campaign variables are correctly labelled.

Source: http://support.google.com/googleanalytics/bin/answer.py?hl=en-GB&answer=55581

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