Google AdSense 'better contextual matching' ads

Google is continually making improvements to match the ads to your content so that users see even more relevant ads. “A "referral URL" is one of many signals used to deliver contextually relevant ads on your website, and contains information about the link a user followed to arrive at your website, be it from a […]

Google is continually making improvements to match the ads to your content so that users see even more relevant ads. “A "referral URL" is one of many signals used to deliver contextually relevant ads on your website, and contains information about the link a user followed to arrive at your website, be it from a search engine or another site on the Internet. Google then use the query words in the referral URL to deliver relevant ads, and recently started to expand the use of the query words in referral URLs to a few hours so we can so we can continue to deliver more relevant ads. The technical way that we're doing this is by associating the relevant query words in the referral URL with the existing advertising cookie on the user's browser. After a short period of time (a few hours) the query words are no longer used for the purposes of matching ads. Of course, users can continue to opt out of our advertising cookie at any time here. This allows us to deliver more relevant ads on a wider range of AdSense partner sites that a user may browse over the course of a few hours,” AdSense blog noted.