foaf

from Jargon File (4.4.4, 14 Aug 2003)

FOAF
 //, n.

   [Usenet; common] Acronym for `Friend Of A Friend'. The source of an
   unverified, possibly untrue story. This term was not originated by
   hackers (it is used in Jan Brunvand's books on urban folklore), but is
   much better recognized on Usenet and elsewhere than in mainstream
   English.

from The Free On-line Dictionary of Computing (8 July 2008)

FOAF

   [{Usenet}] Friend Of A Friend.  The source of an unverified,
   possibly untrue story.  This term was not originated by
   hackers (it is used in Jan Brunvand's books on urban
   folklore), but is much better recognised on {Usenet} and
   elsewhere than in mainstream English.

   [{Jargon File}]

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

FOAF
       Friend Of A Friend [vocabulary] (RDF)

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