A "source" has told Stefanie Olsen at News.com that Yahoo will finally launch its contextual ad network for small publishers and bloggers tomorrow. Like Google's service, Yahoo's self-serve product will display text ads deemed relevant to the content of specific Web pages. Advertisers pay only when a reader clicks on their ads. Yahoo and publishers will split the fees. Yahoo's new service will differ from Google in that it will add human editorial to the selection of ads for content pages. In comparison, Google's service relies on technology....
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