second screening
pp. Using a mobile device to monitor and post social media comments about what you are watching on TV or at the movies.
second screener n.

Example Citations:
She also pointed out that The Killing's being subtitled prevents viewers from "second screening", swapping smart-alecky comments about the unfolding drama on Twitter and other social media as they're watching — and so maybe makes them concentrate on the show that little bit harder, and draw more rewards from it.
—Keith Miller, "Fair Isle sweaters optional at the Hay Winter Weekend," The Telegraph, December 1, 2012

DCM, which is a joint venture between Odeon and Cineworld, wants to change the perception of what advertising at the cinema can offer and is testing a mobile app that encourages second screening.
—Mindi Chahal, "Blockbuster ads in a digital age," Marketing Week, December 6, 2012

Earliest Citation:
In the US, a joint Nielsen and Yahoo study late last year found that the trend is already well established with over 86% of mobile internet users choosing to communicate with each other in real-time during broadcasts. Now 'second screening' as it is referred to in the States has become common place in the UK too.
—Tom Collinson, "Under 25's swap remote controls for iPhones as 'Social TV' trend takes over," Digital Clarity, March 8, 2011

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