Microsoft CEO Steve Ballmer said Thursday in the US that its on-again, off-again talks with Yahoo were firmly in the "off-again" phase.
Google filed a lawsuit against an Internet operation that it claims systematically clicked on text ads to defraud its advertising network.
Sensis is sizing up its Yellow Pages customer base for its pay-for-performance search advertising product.
Online advertisers' demand for exposure in the results of Google, Yahoo and other search engines, may soon outpace the supply and drive up prices, according to a new study.
Internet marketers facing higher advertising fees on search networks are becoming increasingly concerned about a form of online fraud that was thought to have been contained years ago.
Google and others are under scrutiny as advertisers fret about phony clicks.
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