Referrals are from or

Traffic from your ads served on AdSense or DoubleClick.

Referrals from are clicks on your ads showing on the Google Display Network—specifically, ads showing on publisher sites in the AdSense program—for which the destination URLs have not been tagged.

If you notice appearing in your reports, check to see if auto-tagging is turned on in your AdWords account, and that your own campaign variables are labeled correctly.

Similarly, referrals from are clicks on ads showing on the DoubleClick network.

Related resources

Learn more about Destination URL tagging.

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