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1.
1.The act of helping a friend fine tune their twitter updates. Either to make them funnier or more concise.

2. Knowingly coming up with tweets for a friend or colleague.

3. Tweeting for a company or entity under the guise of being them.

4. Tweeting as a celebrity without their knowledge.
"Wow, Jane's last tweet was hilarious. she must have a funny ghost tweeter."

or

"That's not really Ashton Kutcher on twitter. That is a ghost tweeter."
by @offdutygnome August 04, 2009