Ruven

This plugin provides a function to output links to share a post to Facebook, Twitter, and Google+.
Selected themes by Ruven will display the links automatically when the plugin is activated. 
In other themes you will have to edit the templates in your theme in order to output the links.
Here an example of outputting the links in as list:
<pre><code><?php
if(function_exists('ruven_sharing_links')) {
 echo '<ul class="sharing-list">';
 $sharing_links = ruven_sharing_links();
 foreach($sharing_links as $sharing_link) {
 echo "<li>$sharing_link</li>";
 }
 echo '</ul>';
}
?>
</code></pre>
<h4>Usage</h4>
<pre><code>$sharing_links = ruven_sharing_links( $get_array, $include, $open_in_new_tab, $class );
</code></pre>
<h4>Parameters</h4>
$get_array 
(bool) (optional) If you want the return value to be an associative array (title, URL) or an array of HTML links. By getting an associative array, you are able to customize the output more.
Default: false
$include 
(array) (optional) If you don’t want all platforms (Facebook, Twitter, and Google+) included, you can specify here which you want specifically to be returned. E.g. <code>array('Twitter', 'Facebook')</code> would only return Twitter and Facebook links.
Default: array()
$open_in_new_tab 
(bool) (optional) If you want the sharing dialog to be opened in a new tab/window or not.
Default: true
$class 
(array) (optional) Classes you want to add to the links. E.g. <code>array('sharing-button', 'big-button')</code>
Default: array()
<h4>Return Value</h4>
If the value of <code>$get_array</code> is <code>false</code> (default), the function returns an array of HTML links.
If the value of <code>$get_array</code> is <code>true</code>, the function returns an associative array of the title (e.g. “Twitter”) and the URL to share the post.

Ruven Themes: Sharing Links

RT Sharing Links provides a function to output links to share a post to Facebook, Twitter, and Google+.

Nick Halsey

This plugin, like many others, adds content-sharing functions after your posts (and optionally pages and media attachments). But the similarities end there.
QuickShare is quick because it doesn’t run 3rd-party sharing JavaScript; in fact, there is no front-end JS. The sharing functions are built into links that take the user (in new tabs) to the native sharing interface on each social media site.
You can choose which social media sites to include from: Facebook, Twitter, Pinterest, Linkedin, Google+, Tumblr, Reddit, and StumbleUpon. A basic email function is also available.
The share bar appearance is highly customizable and share functions can be displayed as either icons, Genericons or text. Each display method features different customization options; customize through the settings page or with custom CSS.
QuickShare can be displayed at the end of ever post, page, and/or attachment, or all post types automatically. Or, you can use the <code>[quickshare]</code> shortcode to display QuickShare wherever you’d like in any of your posts/pages. You can also exclude posts by id, or even use a custom output function in your templates, including the ability to override the default generated sharing data.
As a bonus, QuickShare includes several built-in CSS3 effects for hover state animations.
Please visit the plugin support forum for help with custom css snippets and/or feature requests!
Please note that QuickShare does not and will not support link tracking, because of its goal of being simple and lightweight. You can use a 3rd-party tool like Google Analytics to track shares as external links.

QuickShare

This plugin, like many others, adds content-sharing functions after your posts (and optionally pages and media attachments).

Ruven Themes: Sharing Links vs QuickShare