Yahoo has moved to further strengthen its service to advertisers by buying web marketing business BlueLithium for $300m (�149.4m).Set up in 2004, BlueLithium provides technology enabling websites to better match adverts with users' interests.
The purchase is the latest in a series of deals by Yahoo as it seeks to regain ground on market leader Google in the web search sector.
In June, boss Terry Semel quit after concerns about the firm's direction.
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