• The New York Times, Monday, March 19, 2012 2:21 PM

Nielsen will begin selling "what many advertisers have been clamoring for": cross-platform campaign ratings, a system that combines its existing TV ratings with its new online campaign metrics, according to Brian Stelter.

Touted as a "major breakthrough" by a Nielsen exec, the system will show the overlap between the reach of a TV and online campaign, writes  Stelter. "The lack of overlap has posed problems for media buyers in the past."

Group M will be the first agency to use the system, which will -- of course! -- also be available to other companies.

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