Havas clients such as Coca-Cola, Reckitt Benckiser and Sony will be handed the tools to track the path to purchase across devices, platforms and publishers following the agency network’s global deal with Facebook’s Atlas ad platform. Advertisers with the holding group are already migrating to Atlas in a move that will see them try to make headway in measuring media ROI with new reporting capabilities. Facebook touted Atlas as the solution to the mobile conversion conundrum when it launched last September.