Friend of a Friend: FOAF
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So I added my own FOAF link on my home page.
For those who aren’t familiar, Friend of a Friend is a protocol defined to help machines read relationships between entities (persons) on the internet. The relationships are set up in RDF file. (Mine is severely limited - either I have no friends - or am just lazy - you tell me!) For more info, check out http://www.foaf-project.org/.
By far, the best library I’ve found for parsing FOAF files is located here: http://gna.org/projects/phoaf