Only 98,600 people wrote messages on Twitter about the two-hour season premiere of Greys Anatomy last month. Thats a tiny fraction of the 9.3 million who,according to Nielsen,watched the show that night.
Two episodes of NBCs The Voice ranked in the top 10,reaching 3.8 million and then 2.7 million accounts.
But the posts,225,000 of them in total,were seen by millions of Twitter users,some of whom might have fired up their digital video recorders or laptops to watch the episode later.
Nielsen is now measuring what it calls the unique audience for Twitter posts about television,providing a more complete view of the phenomenon known as social TV.
The company has introduced Nielsen Twitter TV Ratings,a product announced last year that professes to measure all the activity and reach of Twitter conversation about shows,even if it has yet to be embraced by television executives and gain a broad client base.
We feel this is going to be a credibility-building moment for the industry, said Andrew Somosi,the chief executive of SocialGuide,an analytics company that Nielsen acquired last November,in part to create the new product.
Measures of posts about a TV show (Cant wait for The Walking Dead to start) are just the tip of Twitters iceberg,Somosi said in an interview: The full iceberg is the extent to which people are seeing those tweets. For example,the 225,000 posts about the September 26 episode of Greys Anatomy were seen by 2.8 million distinct Twitter accounts,according to Nielsens algorithms.
It is impossible to say how many of those users watched the show as a result of the posts,but previous research has found that Twitter activity sometimes spurs viewership. Twitter has made collaboration with the television industry a priority as it seeks to impress investors; the prospectus for its initial public offering,published Thursday,mentioned television 42 times.
Executives at Nielsen say they expect that TV networks will start to promote their Twitter TV Ratings performance the same way they do broadcast ratings.
This is just the beginning; the data hasnt been available until now, said Sean Casey,who founded SocialGuide and is now its senior vice-president for product.
During the week of September 23,for example,the finale of AMCs Breaking Bad ranked one in the Twitter TV Ratings,with 1.2 million posts that reached 9.3 million Twitter accounts,according to Nielsen. Two episodes of NBCs The Voice also ranked in the top 10,reaching 3.8 million and then 2.7 million accounts. Interestingly,one of four new episodes that week of Jimmy Kimmel Live cracked the top 10. It was the one broadcast September 24,during a Twitter feud between Kimmel and Kanye West.
Some networks may question Nielsens methodology,especially since a TV-related post is said to be viewed whenever it is loaded on the Web or whenever it shows up on screen,however briefly,on a mobile device.
More generally,scepticism abounds about how representative Twitter chatter is or isnt.
What people often lose sight of is the fact that the overwhelming majority of conversations about TV shows still take place offline, said Ed Keller,the chief executive of the Keller Fay Group,a market research firm that specialises in word of mouth and supplies data to networks like CBS.
The conversations that take place in the real world can often be quite different from those that take place on social media, Keller said.