theode

With the use of shortcodes it is possible to react to the content by emojis. 
So you install the plugin and create new emoji with a title an emoji itself, a count field and an initial count, to fake the initial value of the clicked emoji. 
The shortcake is [emojized id=“8” count=“true”] (or false or empty)
In the new version you can limit votes to one per user.
This plugin demands WP REST API plugin.
It has the same approach as the plugin “Emoji Reactions” 
https://wordpress.org/plugins/emoji-reactions/ 
but that seems to be discontinued.
https://www.youtube.com/watch?v=VaNw_Xh35NM
So have fun with emojis.

Emojized

Emojized allows visitors to a WordPress site to rate and react to content using Emojis. Because text without them is  🅱🅾®ℹ️🆖

Heateor Support

Add Smile, Lol, Love, Sad, Angry, Wow and Thumbs up emojis to your posts.
This plugin does not save any cookie in the browser of the user visiting the website having this plugin installed
<h4>Feature list</h4>
<ul>
<li>GDPR Compliant</li>
<li>Compatible with Gutenberg editor</li>
<li>6 emojis – Smile, Lol, Love, Sad, Angry, Wow and Thumbs up</li>
<li>FREE Icon Customization options</li>
<li>Options to specify reaction icon shape – Square, Round and Rectangular</li>
<li>Options to specify reaction icon size – minimum 16 pixels, no upper limit</li>
<li>Options to specify reaction icon backround color and logo color</li>
<li>Reaction counter customization options</li>
<li>Enable/Disable vertical/floating reaction bar on mobile device</li>
<li>Standard and Floating layout for Reaction icons</li>
<li>Rearrange Order of Reaction icons</li>
<li>Specify Position of Social Reaction Bar with respect to the content of the web page – Top and Bottom</li>
<li>Enable/Disable Social Reaction on default/custom post types</li>
<li>Enable/Disable Social Reaction on individual pages/posts</li>
<li>Enable/Disable total/individual reaction count(s)</li>
<li>Mobile Responsiveness</li>
<li>Compatible with AMP</li>
<li>Enable Reaction Buttons at WooCommerce products</li>
<li>Widget and Shortcode</li>
<li>Compatible with BuddyPress, BBPress, WooCommerce</li>
<li>Multisite Compatible</li>
<li>Supports HTTPS enabled websites</li>
<li>24/7 quickest support</li>
</ul>
<h4>What makes this plugin Stand Out from others?</h4>
<ol>
<li>Free: Yea, right. It is a free plugin. You need not pay single penny to use the features of this plugin.</li>
<li>No Need to Register Anywhere: You do not need to create account at our website to use this plugin.</li>
<li>No Middle Layer: Plugin runs totally on your website server without any communication to our servers.</li>
<li>Absolutely Simple: Plugin configuration is intuitive and simple.</li>
<li>Free Icon Customization: Icons can be customized in thousands of ways using the options available within the plugin, for FREE.</li>
<li>Mobile Responsiveness: Icons can be adjusted according to the width of mobile device, using the plugin options.</li>
<li>Perfect Vector (SVG) Icons: Social Share icons are Scalable Vector Graphics, meaning these load fast, scalable to any size, and are stunning on High-PPI screens (Retina and Retina HD displays).</li>
<li>Optimal Loading time: Loading time of Social Reaction icons is optimal and if you compare with other plugins, you will find it less than that of all those plugins.</li>
<li>Lightweight Code: Our developers follow best coding practices to ensure efficient loading and performance.</li>
<li>We promise to provide best quality among other similar plugins. If you find our plugin is lacking some feature, you can email us and we will do our best to include that feature in our plugin as soon as possible.</li>
<li>Our support team is working 24/7 to answer your queries and assist you. You will find us the quickest to respond.</li>
</ol>
<h4>Important links</h4>
<ul>
<li><a href="http://support.heateor.com/category/reaction-buttons-for-wordpress" rel="nofollow ugc">Customization</a></li>
<li><a href="https://www.heateor.com" rel="nofollow ugc">About Us</a></li>
<li><a href="https://www.facebook.com/Heateor" rel="nofollow ugc">Our Facebook Page</a></li>
<li><a href="https://twitter.com/Heateor" rel="nofollow ugc">Our Twitter Page</a></li>
<li><a href="http://support.heateor.com" rel="nofollow ugc">Support Documentation</a></li>
<li><a href="https://www.heateor.com/social-analytics-reaction" rel="nofollow ugc">Social Analytics</a></li>
<li><a href="https://www.heateor.com/add-ons" rel="nofollow ugc">Add-Ons</a></li>
</ul>
You can provide your feedback at hello[at]heateor[dot]com

WordPress Social Reaction Plugin – Reaction Buttons For WordPress

Let your website visitors react to your posts by adding reaction buttons to your web pages

Emojized vs WordPress Social Reaction Plugin – Reaction Buttons For WordPress