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1.
An e-mail acronym: Not For BlackBerry

NFBB can be placed at the beginning or end of the subject of an e-mail message.

NFBB messages are usually long, detailed, and may require a response. Therefore, it would be more appropriate to read the message when someone has the time and screen space.
NFBB: Revised lease agreement
by EatsKugel December 11, 2011