Google, with its deep reservoir of data about online behavior, gathered by tracking hundreds of millions of computers, is for the first time testing ways to use some of that information to aim advertising at Web surfers who use its search engine.
Ads that a person sees on one Google search may be influenced by what was searched a few minutes earlier. Searching for “scuba,” then something else, and then “vacations” could pull up ads for diving trips, for example.
This change in Google’s approach was discovered by Gene Munster, a securities analyst at Piper Jaffray, who this year started a series of tests looking at which ads were displayed in a series of queries on Google’s search engine. Google assigns every computer that visits its sites a unique number, known as a cookie, and records searches and other activities in an unimaginably large file with those cookies.
The company had previously said that it had not used any of that information to draw inferences about users for the purpose of selecting ads to show them.
Google changed its privacy policy a few years ago and warned users that it might capture personal information about them for reasons that include “the display of customized content and advertising.” Last year, Google started looking at the immediately previous search when considering ads. Google did not need to use its cookies for this because Web browsers report the address of the previous site visited to the current site being visited. And in the case of a search, that address contains the search terms.
Nick Fox, a director of product management who looks after ads on Google’s search site, said the company was now testing the use of more search queries in its ad targeting. He did not describe how it was doing that. But Internet experts said that…






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