Read this: Nielsen to Track Online TV Viewers - WSJ.com
Summary: The TV networks will use the program primarily to track viewership of programs on their own websites. NBC, for example, will allow Nielsen to gather usage data for some shows that it streams on NBC.com. The networks can then compare their internal viewership data with Nielsen's to gain comfort with the new ratings system before it is established more broadly. - online.wsj.comonline.wsj.comNielsen to Track Online TV Viewers - WSJ…
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