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Socialuty
Socialuty aims to be a distributed social network: each user can have it's own ”web-pear” (that could host more than one user, anyway), and comunication among pears is made through the socialuty protocol, just like p2p.
Socialuty is also the first “web-app” implementation of the pear in php, but ideally anyone could write it's own, even a desktop one.
Users can edit and optionally share blog, links, photos, calendar, addressbook, files, etc. The architecture is modular and anyone can write some custom plugins, with the aid of the su API.
All content is searchable by tags and each node of the network asks in its neightborood that in turn spread the search to its neightborood and so on.