Rumor has it that Google will be launching its much-publicized “interest-based advertising” in April, allowing advertisers to serve ads based on a user’s prior interactions (e.g., browsing the advertisers’ websites, tracking interests). Google will track categories of web pages that users visit in Google’s content network and if, for example, a user visits motion picture and film pages, Google may add them to a corresponding interest category that might be labeled “motion picture aficionado.” As we understand it, Google will enable use of the DoubleClick DART cookie in advertising served on websites with AdSense for content advertising. Thus, when a user browses an AdSense publishers’ site and views or clicks an ad, the user’s browser may have a cookie added.

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