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1.
When someone follows you on Twitter and requests that you follow them back.
"Hey, I just followed you on Twitter! Gimme a follaback!"
by lovehound August 20, 2009
 
2.
the decision to follow somone on twitter after they first decide to follow you.
abundant energy decided to folla back daklute after he first followed them.
by daklute August 10, 2009