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1.
A citizen of twitterspace, someone who resides in the cyberspace area of twitter. Someone who twitters.
Brian, you twitter all the time. You are a model twittizen.
by BrianCarter April 15, 2008
 
2.
A person who is a member of Twitter. Created by combining the word Twitter and citizen together.
I am a twittizen because I'm a member of Twitter.
by missmollymeow May 07, 2009