tweetaholic

Noun

 * 1)  A heavy user of the  microblogging service; a person addicted to tweeting.
 * 2) * 2011, John Mayer, quoted in Rena Bivens, Digital Currents: How Technology and the Public are Shaping TV News, University of Toronto Press (2014), ISBN 9781442615861, page 17:
 * You're coming up with 140-character zingers, and the song is still four minutes long ... I realized about a year ago that I couldn't have a complete though anymore. And I was a tweetaholic.