Eric Buckley

This plugin adds Social Sharing buttons to the bottom of content in pages and posts.
We have purposely excluded the Home page for inclusion of the buttons. The script should work for custom post types as well.
Please keep in mind this is a very simple implementation. There are no Admin settings or configuration pages. If you wish to have any social networks added that are not shown, please send me a message and I will add these.
<h3>Resources</h3>
We wanted to add a section to provide link to some of the resources we used to make this plugin possible.
Helpful resources:
<a href="https://github.com/bradvin/social-share-urls" rel="nofollow ugc">Social Share URLs</a> – A helpful, open source list of the latest URLs for sharing content on social networks.
<a href="https://fontawesome.com/" rel="nofollow ugc">FontAwesome</a> – A free resource for professional website and application icons.

InstaShare Social Sharing

This plugin adds Social Sharing buttons to the bottom of content in pages and posts, so your visitors can share your website's content.

scibuff

If you would like to increase the exposure of your blog WordPress Connect 
it the perfect plugin for you. It comes with a unique set of tools through 
which you can reach the largest social networking community on the planet 
that would engage and then share and discuss your content. It will enable 
you to build up a fan base and to connect with a wider and a more relevant 
audience. Now your blog readers with a Facebook account can post comments, 
create discussions and like your posts and pages.
The plugin integrates Facebook Social plugins with WordPress. It provides 
tools to add the Facebook Like Button and Facebook Comments automatically 
to every post and page. Of course, the user has a full control over settings 
such as width, font, color scheme, etc.
WordPress Connect also provides fully customizable WordPress Widgets for the 
following Facebook Social Plugins
<ul>
<li>Activity Widget</li>
<li>Comments Widget</li>
<li>Facepile Widget</li>
<li>Like Box Widget</li>
<li>Like Button Widget</li>
<li>Live Stream Widget</li>
<li>Login Widget</li>
<li>Recommendation Widget</li>
<li>Send Button Widget</li>
</ul>
The widgets can be added to your blog just as easy as any other WordPress 
Widget, i.e. through the widgets page (under Appearance on your Dashboard).
Since 2.0, all WordPress Connect widgets are rendered in the XFBML mode (i.e 
no iframes) to provide full functionality the iframe versions may lack.
A big addition since 2.0 is a simple yet powerful <a href="http://wp-connect.tomasvorobjov.com/api/" title="WordPress Connect API" rel="nofollow ugc">API</a> 
for plugin and theme developers who can now specify default settings for WordPress 
Connect to reflect the needs of their plugin/theme. The API provides an easy 
way to include any widget (such as the Like Button of Comments) anywhere in 
the theme, e.g. to add the Like Button to the header or Comments to the 
footer.
Requirements
<ul>
<li>PHP 5.2.0 or newer</li>
<li>WordPress 3.0 or newer</li>
</ul>

WordPress Connect

This plugin integrates the Facebook Social Plugins with Wordpress.

InstaShare Social Sharing vs WordPress Connect