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Advertising agencies have long been big customers of Google, Microsoft and other Internet companies, shifting an increasing portion of ad budgets online. WPP Group, the largest ad agency owner, spends $850 million a year of its clients’ money with Google, according to Martin Sorrell, WPP’s chief executive. Ninety-eight percent of Google’s revenue comes from advertising, largely from “sponsored links” that appear alongside its search results.

— Foes No More, Ad Agencies Unite With Internet Firms - NYTimes.com