In the Upfront, GroupM Is Sticking With Nielsen for Now, but It’s Testing iSpot, Comscore, VideoAmp for the Future

In the Upfront, GroupM Is Sticking With Nielsen for Now, but It’s Testing iSpot, Comscore, VideoAmp for the Future

Media buyer’s clients Unilever, Nestle, Ferrero, Dominos, TJX, Mars kicking tires on alternative currencies.