likeagency

This plugin allows you to add a widget with custom text, link and a FontAwesome icon. In order for this plugin to work, please make sure you already use FontAwesome toolkit in your theme.
List of features:
<ul>
<li>Choose FontAwesome icon as an image for the button.</li>
<li>Add your own text and title for the widget.</li>
<li>Select header tag for the title.</li>
<li>Customize your FontAwesome image (position, color and background color).</li>
<li>Add custom URL to use the widget as a link.</li>
<li>Add extra button displayed below, with your own text.</li>
<li>The widget has its own stylesheet included, however with just necessary CSS to be displayed properly, so it doesn’t override the style for any theme you currently use. </li>
<li>You can also add your own CSS for this plugin via its Settings page.</li>
</ul>

Button with FontAwesome icons by LIKE.agency

This plugin allows to add a widget with custom text, link and a FontAwesome icon.

Jakob Lenfers

This addon adds buttons below your posts (or somewhere else) to make it easy to get reactions to the post, but without the hassle of writing a whole comment. It makes it easier for the reader to interact with you. The buttons are configurable (how many, what text, position) and simply are counters to how often they were clicked. There is also a widget and a shortcode to show the top x posts with the most clicks for each button.
The idea is inspired by a <a href="http://bloggerindraft.blogspot.com/2008/08/new-feature-reactions.html" rel="nofollow ugc">blogger feature</a> and since it’s been my first addon, I borrowed the structure from <a href="https://wordpress.org/extend/plugins/sociable/" rel="ugc">sociable</a>.
<h3>Restrictions</h3>
<ul>
<li>When using plugins to cache the pages, the buttons won’t be up to date. They will increment through the javascript, but when the page reloads the old count will show again, until the cache is deleted. Check the FAQ on possibilities how to change that.</li>
</ul>

Reaction Buttons

Adds buttons for very simple and fast feedback to your post. Inspired by Blogger.

Button with FontAwesome icons by LIKE.agency vs Reaction Buttons