Joel De Gan of PeoplesDNS has posted Whats the problem with FOAF?. He intends to add centralization, private information, social circumstance, and groups - all through his FOAF dns concept. It looks like he will use the RELATIONSHIP (the older one?) and Trust ontologies in this effort.

I am very interested in how community centers will use concepts such as pDNS and what their role in the development of open social networking will be. Social "routers" will be able to provide a level of customization (of information, participation, formality, and privacy) which will be required to break social networking away from the big social networks.

PeopleDNS will use a "De Gan Filter" to handle the anticipated large dataset. Last week, Danny Ayers posted a brief summary of De Gan's implementation of bloom filters.