chatterboxing
pp. Watching a TV show while talking to other people about that program online.
chatterboxer n.

Example Citations:
Chatterboxing is particularly popular during soaps — almost 40,000 tweets are made during an episode of EastEnders. Juicy storylines can see tweets hit 6,000 a minute.
—Robert Wright, “Why we’ll never get fed up watching the telly,” Sunday Post, August 7, 2013

Where many other types of media use might be seen to be taking viewers away, chatterboxing can actually serve to reinforce more traditional television viewing habits.
—Sarah Martindale, “Viewers are changing TV for good,” The New Zealand Herald, August 29, 2013

Earliest Citation:
Research conducted for TeleScope 2012, which looks at the UK’s TV viewing habits, suggests that the trend of commenting via a second screen about a programme, or ‘chatterboxing’, is starting to grip the nation. A quarter of all adults (26%), and just under half (44%) of those aged under 35, say they have commented to others, online or via SMS, about a TV programme they have been watching.
—“TeleScope 2012 report reveals nation’s love for TV,” TV Licensing, March 15, 2012

Notes:
This term is a portmanteau of the words chatter (what people generally do on social media) and box (a colloquialism for TV set, which the OED dates all the way back to 1950).

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