danielfaerber

If you install this plugin on your blog, your visitors get two buttons below your posts and pages:
<ul>
<li>A Facebook “share” button</li>
<li>and a Twitter “tweet” button.</li>
</ul>
These are not the standard Like- and Tweet-Buttons, which also display how many people have clicked on it so far, but basically pure and simple html-links.
DISADVANTAGE:
<ul>
<li>Less interaction.</li>
</ul>
ADVANTAGES:
<ul>
<li>It’s faster. Your blog does not have to contact Facebook’s and Twitter’s servers.</li>
<li>Better privacy. No information about your visitors is sent to Facebook or Twitter. Nota bene: Facebook’s standard like button allows Facebook to track your visitors even if they do not click on it!</li>
</ul>

Fastershare

This plugin allows your visitors to share your posts on Facebook and Twitter, without JavaScript or iFrames.

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

Fastershare vs OExchange