Lopo Lencastre de Almeida

Automatically add links to your favorite social bookmarking site on your posts, pages and in your RSS feed. WordPress 2.6 or above and Sociable 3.4.1 or above is required, if you use an older version of those, please upgrade.
More info:
<ul>
<li>More info on <a href="http://yoast.com/wordpress/sociable/" rel="nofollow ugc">Sociable</a>, with info on how to add sites to it, and how to integrate it into your WordPress in other ways.</li>
<li>Check out the other <a href="https://wordpress.org/extend/plugins/profile/ipublicis" rel="ugc">WordPress plugins</a> by the same author.</li>
<li>Also at <a href="http://box.net/iPublicis4Wordpress" rel="nofollow ugc">iPublicis4Wordpress</a>.</li>
</ul>

DoMelhor for Sociable

Automatically add links on your posts, pages and RSS feed to your favorite social bookmarking sites. Requires Sociable 3.4.1 or above.

Automatically add links on your posts to popular social bookmarking sites like Facebook, Mixx, StumbleUpon, Digg and many many others.
More info:
<ul>
<li><a href="http://blog.itechtalk.com/2008/service_link//" rel="nofollow ugc">Service_link</a>.</li>
</ul>

Service_link

Automatically add links on your posts to popular social bookmarking sites.

DoMelhor for Sociable vs Service_link