* $27 billion in media buying contracts up for grabs * Brands like Unilever, Volkswagen demand cheaper fees * Tech changes role of ad agencies, threatens margins * Trust between big companies, agencies at an ebb By Leila Abboud and Jennifer Saba CANNES/NEW YORK, June
Read moreBy Eric Auchard and Leila Abboud FRANKFURT/PARIS, June 22 (Reuters) - Facebook is gaining ground on Google's YouTube as an outlet for big companies to market their products via online videos, the fastest growing category of Internet ads, a report published on Monday said. The competit
Read moreGroupM, the media investment management arm of advertising and media giant WPP, has bought Dutch business Greenhouse Group. The acquired company provides digital media and marketing services through its four operating companies: online market agencies Blue Mango Interactive and Fresh Fruit Digital,
Read moreAdvertising agency WPP said on Wednesday that it has increased its stake in Denmark-based software supplier TechEdge to 49% from 20%. TechEdge's unaudited net sales for the year ended 31 December 2014 were around $13.6m, with gross assets at approximately $6.3m. TechEdge licenses a range of softwar
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