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3.
When you update your Twitter status and use that same status for Facebook, or vice versa.
Jane: "You see Frank had the same status for Facebook and Twitter today?"

Sean: "Yeah I guess they're calling that Twitterbook now."

Jane: "He even used the same hash tag on Facebook."

Sean: "What a tool."
by C-Money8691 February 15, 2012
 
1.
Proper Noun. The new Facebook.

The bastard child of Facebook and Twitter.
"Man, did you check the Twitterbook today?"
by Tzar Romulus March 13, 2009
 
2.
(verb) When a Facebook user uses his/her status as they would use a Twitter.
Jane Doe is eating breakfast. 9:00am

Jane Doe is washing her dishes. 9:30am

Jane Doe doesn't like doing the dishes. 9:45am

John Doe things Jane Doe needs to stop Twitterbooking. 10:00am
by Rose Tyler-Tennant August 02, 2009