@maloki It's a formal description of online "agents" (humans, machines, groups - the name is Friend Of A Friend and is designed to graph social relationships). Based on W3C "RDF" standard etc: http://xmlns.com/foaf/spec/ and more on #: https://en.wikipedia.org/wiki/FOAF_%28ontology%29

My # profile document (can be used as a seed to start crawling the !fediverse): https://social.umeahackerspace.se/mmn/foaf

I can't find @chimo's example visualisation right now unfortunately.