Mehul Rojasara

“I like” plugin will help you to add like and dislike functionality to your post, so you can easily monitor which posts are much liked or disliked by visitors.
when people will visit your blog and find that useful they can react to your post without wasting time writing a traditional comment. also, you can monitor your post with total likes and dislikes. 
you can customize like and dislike labels as your needs also can use only the icon button.

I like

Useful for instant reactions also for monitoring how people like the post.

Useful plugin for instant reaction.

Beautiful like and dislike buttons on each post, display total likes and dislikes of our visitors.

Julio Potier

Add boutons for “Like” or “Unlike” (can be set up) your posts and pages. Buttons are fully customizable !

BAW Like Unlike

Add boutons for "Like" or "Unlike" (can be set up) your posts and pages.

I like vs BAW Like Unlike