Gene Policinski: Tweeting — and setting the nation’s ‘chat agenda’

  From Sean Penn and the Oscars to Keith Olbermann and Bill O’Reilly at their cable TV perches, and with a dash of national security issues for good measure, we’re “all atwitter” – literally.

  Twitter – the 140-character social media phenom – is used by just 23% of adult Americans who are online, according to a 2014 Pew Research Center report. For teens, surveys say it’s about one-quarter of online regulars, and rising quickly.