Ko Min

A plugin to site owner to add voting functionality to the blog posts. 
Using the power of the ajax, voter can have instant voting and update to top voted widget. 
It doesn’t matter voter is logged in or not. Public voting is done by tracking their IP address. 
It isn’t end here. Blog owner will have complete control over those voting feature as well as using custom 
vote button and vote text.
Features
<ol>
<li>Control voting feature via voting on/off (admin feature)</li>
<li>Control allow or disallow post author to vote his own posts (admin feature)</li>
<li>Control allow or disallow public voting (admin feature)</li>
<li>Customise vote and voted text (admin feature)</li>
<li>Customise vote and voted buttons images (admin feature)</li>
<li>Customise alert message for non logged in users (admin feature)</li>
<li>Voting logs for site administrator (admin feature)</li>
<li>Sort voting logs by vote count or voted date (admin feature)</li>
<li>Show current vote count and vote button on frontend templates</li>
<li>Compitible with almost all of the themes. You just need to call required function from your template</li>
<li>Total vote count widget</li>
<li>Top voted widget</li>
<li>Now public voting supported.</li>
<li>Now shortcode supported. e.g. [wpvoting]</li>
<li>Top voted posts list shortcode</li>
</ol>
Features in future releases
<ol>
<li>Export to CSV for admin voting logs</li>
<li>Registered user voting logs</li>
<li>Re-implement backend voting log list with WP_List_Table class</li>
</ol>
Note-1: Kindly please rate this plugin or vote the compatibility. So I could review it and improve the quality of this plugin. Appreciate your help!
Resources
http://www.garyc40.com/2010/03/5-tips-for-using-ajax-in-wordpress/
http://www.onextrapixel.com/2009/06/22/how-to-add-pagination-into-list-of-records-or-wordpress-plugin/
http://www.onextrapixel.com/2009/07/01/how-to-design-and-style-your-wordpress-plugin-admin-panel/
http://planetozh.com/blog/2009/09/top-10-most-common-coding-mistakes-in-wordpress-plugins/
https://wordpress.org/extend/plugins/vote-it-up/
https://wordpress.org/extend/plugins/shortcodes-ultimate/

WP Voting

Site owner to add voting functionality to the blog posts.

dtsn

The TweetMeme Retweet button is the defacto standard in retweeting – used by some of the biggest websites in the world including Techcrunch.com, PerezHilton.com, Break.com, CNET.com, Wired, Time Magazine and hundreds of other massive brands, in total it is installed on over 100,000 websites around the globe.
“The Tweetmeme button is a fantastic way for our readers to engage with our stories and signals which posts are a hit with the Twitter community. The button has been a valuable addition to our site and consistently drives reader engagement.” Pete Cashmore, Mashable.com
Easily allows your blog post or page to be retweeted. It provides a live count of how many times your post/page has been retweeted throughout Twitter.
<h4>New</h4>
<ul>
<li>Hashtag support (which are automatically taken from your post tags)</li>
<li>Ability to control the length of the tweets</li>
</ul>
<h4>Features</h4>
<ul>
<li>Live count of tweets from Twitter</li>
<li>Allows you to change the source which you retweet, E.g. “RT @yourname “</li>
<li>Easily installation and customisation</li>
<li>Quicker loading times for the buttons</li>
<li>Better integration, allowing custom titles, hashtags and URL shortner</li>
<li>Removes the default “RT @tweetmeme”</li>
<li>Ability to control the length of the tweets (through the new spaces parameter)</li>
<li>Integrates with WordPress MU</li>
</ul>
<h3>Help</h3>
For help and support please refer to the TweetMeme help section at <a href="http://help.tweetmeme.com/2009/04/15/button-faq/" rel="nofollow ugc">help.tweetmeme.com</a>.

TweetMeme Button

The TweetMeme Retweet button is the defacto standard in retweeting - used by some of the biggest websites in the world including Techcrunch.

WP Voting vs TweetMeme Button