singpolyma

Detects hCards, Facebook links, and Wink.com search results and allows the user to add the detected people to their WordPress links system.

Friend Bookmarklet

Generates a bookmarklet that makes it easier to add friends to the WordPress links system.

Matthias Pfefferle

Adds OExchange and Web Intents support to WordPress’ “Press This” bookmarklet (http://oexchange.org).
Supported Plugins:
<ul>
<li>the webfinger-plugin: <a href="https://wordpress.org/plugins/webfinger/" rel="ugc">https://wordpress.org/plugins/webfinger/</a></li>
<li>the host-meta-plugin: <a href="https://wordpress.org/plugins/host-meta/" rel="ugc">https://wordpress.org/plugins/host-meta/</a></li>
</ul>
From the website:
<blockquote>
This’ll help you get up and running, whether you’re a service that can accept content, a site that has content to share, or a tool of some sort. Remember that OExchange isn’t limited to “sharing” things; it applies to any case where one service wants to send URL-based content to another — microblogging, translating, printing, whatever.
</blockquote>

OExchange

Adds OExchange and Web Intents support to WordPress

Friend Bookmarklet vs OExchange