Acronym for "Facebook Best Friends Forever".
Someone you've never met in person, but you have daily exchanges (or more frequent) via Facebook in the form of Wall Posts, status updates, comments, chat and/or private messaging.
ALSO used as FBBFF, BFFB (Best Friends on Facebook) and BFFFB (Best Friends Forever On Facebook).
Dork 1: I wonder if my FBFF is as cool in person IRL as they are on FB!
Dork 2: Well I know for a fact that you're not as cool IRL as you are on Facebook. I posted that on your FBFF's wall, btw.
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