P2P social networking in between blogs, no central server involved.

talkjs

TalkJS

TalkJS is the messaging tool for platforms. Add buyer seller chat to your marketplace, on-demand app, or peer-to-peer chat to your social platform.

Nate Allen

PeerRaiser – Peer-to-Peer Fundraising Donation Plugin

PeerRaiser is a donation plugin that makes it easy to create powerful peer-to-peer fundraising campaigns on your own WordPress site.

This plugin is not longer developed by me, I think it still works, but YMMV.
You’ll want P2P social networker if you
<ul>
<li>Own a WordPress.org blog</li>
<li>Live and breath social networking</li>
<li>Feel limited by your regular social network page</li>
<li>Have the strange feeling in you stomach that you might have some extra spam after your subscription</li>
<li>Are tired of site maintenance and/or downtime of regular social networks</li>
<li>Prefer people who have something to blog about over teenagers who seem to be able to talk about nothing forever</li>
</ul>
P2P social networker offers you
<ul>
<li>The social network functionality you’re used to, like friends, personal messages, updates about friends, etc…</li>
<li>All the WordPress functionality you love</li>
<li>Peer to peer social networking, which means</li>
<li>All your information stored on your own server</li>
<li>If one server goes down, the rest stays up</li>
<li>A network of bloggers without central server intervention</li>
</ul>
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.
<h3>Requirements</h3>
Everything you need to run WordPress 2.8 (which you need for the widget API) plus:
<ul>
<li>cURL – PHP 4.0.2</li>
<li>PHP 5 is advised</li>
</ul>

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