Armel

AP Twitter Follow Button add a widget which allows you to add a highly cutomizable Twitter Follow Button.
<h4>Features</h4>
<ul>
<li>[NEW] Option to set the alignment of the button</li>
<li>[NEW] Option to use iframe instead of Javascript</li>
<li>Option to choose the language of your button</li>
<li>Option to show the number of followers</li>
<li>Option to show the username</li>
<li>Option to activate the large button</li>
<li>Option to activate “Opt-out of tailoring Twitter”</li>
<li>Option to prevent the Twitter <code>widgets.js</code> javascript file from loading</li>
<li>Option to set a maximum width for your widget</li>
</ul>

AP Twitter Follow Button

AP Twitter Follow Button add a widget which allows you to add a highly cutomizable Twitter Follow Button.

demixpress

This plugin makes it even easier and better to display <a href="http://addthis.com" rel="nofollow ugc">AddThis</a> tools for your WordPress site, including share buttons, follow buttons and recommended contents.
To make this plugin to work:
<ol>
<li>You must have an AddThis account.</li>
<li>You CAN NOT use other AddThis plugins.</li>
</ol>
About Social Sharing Optimization
This plugin doesn’t do anything to optimize the social sharing results, if you need this, try a related plugin, such as:
<ul>
<li><a href="https://wordpress.org/plugins/wpsso/" rel="ugc">WordPress Social Sharing Optimization</a></li>
<li><a href="https://wordpress.org/plugins/wonderm00ns-simple-facebook-open-graph-tags/" rel="ugc">Facebook Open Graph, Google+ and Twitter Card Tags</a></li>
</ul>

(dp) AddThis

Makes it even easier and better to display AddThis tools (share buttons, follow buttons and recommended contents) on your WordPress site.

AP Twitter Follow Button vs (dp) AddThis