The Grammys Top Nielsen-Twitter Top 10

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Nielsen Twitter TV Ratings Weekly Top Ten lists are ranked by Unique Audience and include four metrics for each of the top Series and Specials episodes and Sports Events airings.

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Tweets - Tweets ascribed to a linear TV episode.
Unique Authors – Unique Twitter accounts that have sent at least one Tweet ascribed to a specific TV episode.
Impressions - The number of times any Tweets ascribed to a TV episode were seen.
Unique Audience - The total number of distinct Twitter accounts accruing at least one impression of one or more different Tweets ascribed to a TV episode.