Scott Taylor

Like Buttons makes your site instantly share-able. The plugin adds <code><meta></code> tags to your pages’ HTML <code><head></code> which will pull the proper content from your site when someone shares one of your site’s URLs on Facebook. Using some simple Theme functions, you can add Like buttons to posts / pages / custom post types AND a Like button for your blog / website
<pre><code>// in the Loop - for posts / pages / custom post types
the_like_button()

// a Like button for your blog / website, put it anywhere!
the_blog_like_button()

// use this if you don't want to register your app
the_like_iframe()
</code></pre>
Read More: http://scottctaylor.wordpress.com/2011/01/04/new-plugin-like-buttons/

Like Buttons

Adds Open Graph  tags to your posts/pages/etc, adds a Facebook Like button to posts using simple Theme functions. Requires a Facebook Application ID ( …

sudipto

A very simple social share plugin with just 4 social icons. 99% of the posts are share with these 4 social icons (i.e Twitter, FB Like, Linkedin and FB Share) then why to have more. Lesser social icons means less load on pages and you pages will load much faster. Also if you need more, then this plugin give you the ability to add your own custom buttons.
Features of the plugin
<ul>
<li>Vertical scrolling sharebar support</li>
<li>Huge list of options to easily display the buttons where require</li>
<li>Support for <code>shortcode</code> to display anywhere inside your post/page</li>
<li>Display using function call (useful if you want to embed the code directly to your theme)</li>
</ul>
How to use the Shortcode and the Function to display the buttons 
<a href="http://techxt.com/tweet-like-google-1-and-share-plugin-wordpress/" rel="nofollow ugc">Reference on using the shortcode and the function</a>
Check out the options page of the plugin by clicking on the link below 
<a href="http://techxt.com/tweet-like-google-1-and-share-plugin-wordpress/" rel="nofollow ugc">Click here for Screenshots and options available with this plugin</a>
Your suggestion is always appreciated. 
<a href="http://techxt.com/tweet-like-google-1-and-share-plugin-wordpress/" rel="nofollow ugc">Comment on this page </a> to suggest a feature or to report a bug.
<a href="http://techxt.com/" rel="nofollow ugc">Author’s site</a>

Simple Light Weight Social Share (Tweet, Like, Share and Linkedin)

A very simple yet one of the most extensively used social share plugin with vertical scrolling sharebar support.

Like Buttons vs Simple Light Weight Social Share (Tweet, Like, Share and Linkedin)