Publicis Groupe, the world's No. 3 advertising holding company, has struck a sprawling partnership with Facebook, the companies announced last week. Terms were not disclosed, but an executive familiar with the matter valued the deal at around $500 million. So what does that actually mean? Both companies were vague about specific components that were exclusive to Publicis, but they said its shops would gain access to Facebook insight, engineers and creative talent to produce special ad units or content.
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