Re: WPMU + BP + NoseRUB?
The noiserub-protokol is very simular to the open stack. So you can built decentralised networks. It would be very nice to have support for is in Buddypress.
Applications with the NoseRub protocol keep information about profile data for each of the contacts. These profiles get synchronised between the applications/social networks … and can be used by any other NoseRub service. NoseRub uses already available standards like OpenID, RSS and FOAF to provide the goal of having a truely decentralised social network.