Google and the DoubleClick DART cookie:
The DoubleClick DART cookie is used by Google in the ads served on publisher websites displaying AdSense for content ads. When users visit an AdSense publisher's website and either view or click an ad, a cookie may be dropped on that end user's browser. The data gathered from these cookies will be used to help AdSense publishers serve and manage the ads on their site(s) and across the web more effectively.
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