aakash1911

WP Likes lets visitors “like” your posts on the fly. No logging in! 
Easily customizable to be used in various other scenarios. 
Shows top liked posts in sidebar widget or on a separate page.

WP likes

WP Likes lets your blog visitors 'like' your posts on the go.

ahsanic

Express it is a plugin which adds like/dislike button to your post. Readers can like/dislike your post and it will save the ratings to the database. Likes are saved to your website with the help of PHP cookies. Unfortunately if reader is using incognito browser or has his cookies turned of, plugin will not save reader preference, but it will update the like/dislike in the database.

Express It

Express it adds like/dislike button to your post. It lets your reader like/dislike your post, to let you know how they feel about your post.

WP likes vs Express It