Nielsen starting this fall will include viewers who access TV only through an Internet connection as "television households" and in the future will expand the definition to include TV-watching on iPads and other mobile devices. However, the expansion of the TV household classification won't affect ad buying the short term, because only 0.6% of U.S. homes fit the new criteria. "As that statistic shows, a large majority of households have chosen not to cut the cable TV cord," writes Brian Stelter.

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