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.

sakuratan

Social Bookmarking JP plugin embeds links and icons of Hatena Bookmark, Livedoor Clip, Yahoo!JAPAN Bookmark, BuzzURL, Twitter, Tumblr, FC2 Bookmark, newsing, Choix, Google Bookmark, Delicious and Digg to the heading or ending of the post. These are Japanese major social bookmark services (except Delicious and Digg).

Social Bookmarking JP

Embedding Japanese major social bookmark services hyper links and icons

DoMelhor for Sociable vs Social Bookmarking JP