(Reuters) – French advertising agency Publicis Groupe SA and Facebook Inc have struck a multi-year digital marketing deal worth hundreds of millions of dollars, according to a person familiar with the matter. The deal will focus on video ads that appear on Facebooks social network, as well as ads that appear on Instagram, the mobile photo-sharing app owned by Facebook, according to the source, who spoke on condition of anonymity due to a lack of authority to talk publicly about the deal. Under the terms of the deal, Publicis would have access to Facebook user data, enabling it to gauge ad performance on the social network, as well as access to Facebook engineers and other resources to help create special ad units that appear on Instagram, according to Ad Age which first reported the deal on Monday. Facebook declined to comment on the terms of the deal but said in an emailed statement that the partnership with Publicis will center on bringing clients closer to our products, and creating new planning and measurement tools to make buying easier, more efficient, and ultimately prove out ROI (return on investment). The deal will be managed by all Publicis agencies in North America followed by a global rollout, Publicis-owned Starcom MediaVest Groups Anita Mcgorty told Reuters.