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🆖

Artberri

This plugin shows on the Dashboard the Technorati Reactions of your blog. With the WordPress new version (2.5) we have the possibility to add differents feeds to the dashboard, with this plugin you will show the technorati reactions without changing the Google Blog Incoming Links. This plugin will add the reactions to your Dashboard, because I think that Technorati’s reactions are good info too.
Comments, questions and bug reports are welcome: <a href="http://www.berriart.com/technorati-reactions-dashboard-plugin/" title="Berri Technorati Reactions on Dashboard" rel="nofollow ugc">http://www.berriart.com/technorati-reactions-dashboard-plugin/</a>

Berri Technorati Reactions on Dashboard

This plugin shows on the Dashboard the Technorati Reactions of your blog. It is a widget for the dashboard

Emojized vs Berri Technorati Reactions on Dashboard