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>

P2P Social Networker

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

Nate Allen

<a href="https://peerraiser.com/?utm_source=readme&utm_medium=description_tab&utm_content=home&utm_campaign=readme" rel="nofollow ugc">PeerRaiser</a> is a donation plugin that makes it easy to create powerful peer-to-peer fundraising campaigns on your own WordPress site.
Empower individuals and teams to recruit new constituents and fundraise in support of your organization.
<h4>Powerful</h4>
PeerRaiser is fully featured. You can create unlimited campaigns and fundraisers. There are no “add-ons” or extensions to pay for. New features are added on a regular basis to make it even more powerful.
<h4>Customizable</h4>
This plugin takes full advantage of WordPress’ awesome “hooks” system. You can easily customize PeerRaiser by using the built-in actions and filters throughout the plugin.
In addition, the plugin separates the HTML from the PHP into templates that can be overwritten.
To overwrite a template, create a “peerraiser” folder in your theme folder, and copy the template from the “views” folder into it. Make sure to keep the same folder structure.
For example, to customize the donation form, you could copy <code>views/frontend/donation-form.php</code> and place it in <code>your-theme/peerraiser/frontend/donation-form.php</code>, and then make your changes.
Note: We suggest using hooks instead of using this method, whenever possible.
<h4>Easy</h4>
PeerRaiser is so easy to use, you can get setup and accepting donations in minutes! There’s no need to mess with SSL certificates or setup complicated merchant accounts.

PeerRaiser – Peer-to-Peer Fundraising Donation Plugin

This is a well thought out plugin - it has tons of features, worked great with my theme out of the box, and the set-up was very quick.

Lots of features, quick set-up, no code needed

Quick and painless to set it up and really easy to customize

Awesome Plugin!

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

P2P Social Networker vs PeerRaiser – Peer-to-Peer Fundraising Donation Plugin