P2P social networking in between blogs, no central server involved.
This plugin is not longer developed by me, I think it still works, but YMMV.
You'll want P2P social networker if you
P2P social networker offers you
P2P social networker is a social networking plugin to turn your very blog into the centre of your networking needs. Based on open standards like RSS and XMLRPC, P2P social networker allows you to communicate and keep track of what your friends are doing.
P2P social networker makes use of powerful tools included in WordPress, such as Askimet spam filtering and automattic Gravatar images.
P2P social networker is now in a usable state. I will not actively continue development, but I will fix bugs and add requested features, so keep your requests and bugs coming! Visit my blog for more information.