svil4ok

Adds a list of XHTML compliant graphic links at the end of your posts that allow your visitors to easily submit them to a number of social bookmarking sites.
Social sites:
<pre><code>* Svejo
* Favit
* Facebook
* Twitter
* Edno23
* Dao
* Delicious
* Google Buzz
* Google Bookmarks
* Digg
</code></pre>
<a href="http://dev.svil4ok.info/wordpress/add-to-social/" rel="nofollow ugc">Demo</a> | <a href="http://dev.svil4ok.info/wordpress/add-to-social/" rel="nofollow ugc">Plugin information</a>

Add To Social

PResponsive

This plugin will add a image below your posts, allowing your visitors to share your posts with their friends, on FaceBook, Pinterest, Google+, Twitter, Myspace, Friendfeed, Technorati, del.icio.us, Digg, Google, StumbleUpon, and other. After plugin is activated a buttons will appear after the content of the post.Clicking this button will bring the user to the bookmarking site. If the user isn’t logged in they will be prompted to do so. 
Post your articles to the social bookmarking sites and get traffic.

WP Social Bookmarking

WP Social Bookmarking plugin syndicates your blog posts in social networking sites.

Add To Social vs WP Social Bookmarking