PRISM Revelations Hurting Advertisers’ Efforts in Europe, GroupM’s Montgomery

COLOGNE — The US PRISM data snooping controversy has hampered efforts to argue against European ad-targeting rules that are already too onerous, says GroupM Interaction COO John Montgomery. GroupM is the media agency holding unit of WPP. “The US is trying to support self-regulation – we’re trying to avoid any form of legislation by regulating […]