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2 definitions by GriffinR

 
1.
The total universe of Twitter users and their habits. Also called the "Twitosphere," statistics for the Twittersphere include data such as which days of the week have the heaviest Twitter traffic, and the approximate number of followers Twitter users have.
The Twittersphere is abuzz with news of Michael Jackson's death
by GriffinR November 19, 2010
 
2.
Someone who listens to terrible music, specifically electronic music with pre-pubescent voices.
Person 1: Ooh, turn this song up, it's Owl City.

Person 2: Fuck off Owl Citizen.
by GriffinR September 21, 2010