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This tag is used by people who have installed the Selective Twitter Update application on Facebook. Tweets ending in #fb are automatically imported to Facebook, all others are ignored.
Just a note, if #fb appears anywhere other than at the end of the tweet, it will not sync with Facebook.
When ever you see *fb* it means , *facebook* :) there you go !
On twitter "fb" means follow back
FB = Facebook (or) FollowBack [as in #TeamFollowBack, #TFB, etc.]
Fb could mean follow back or facebook
It means facebbok when you see the words FB (: