Nielsen Twitter TV Ratings - Weekly Top Ten 28th Oct - 3rd Nov 2013

Nielsen Twitter TV Ratings Weekly Top Ten list is ranked by Unique Audience and include four metrics for each of the top episodes.

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.