Twitter is rolled out its “Nielsen TV Twitter Rating” system in the US in October. The metric was first announced in 2012, and was developed in partnership with TV ratings-tracker Nielsen. It will show both the number of tweets mentioning specific shows, and the number of accounts those tweets reach.

Nielsen and Twitter aren’t saying how many TV networks or advertisers are currently signed up to use the new rating system, but its introduction shows the micro-blogging platform continuing to cozy up to TV as it courts investors. As The New York Times notes, Twitter’s IPO mentioned television 42 times.

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