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.

richymilo

Leo Gopal

Appends a custom likes box that allows a user to like any post type from the front end. 
Only one like is allowed per user/ip address. 
Once a user has liked the post type they can unlike it again by clicking on the same button. 
Plugin runs by using meta data and ajax.
The Plugin is configured via the admin page which is listed as a sub-menu item under “Settings”. 
The element that the box should be appended to as well as the post type to target should be selected.

Simple custom post likes

Appends a custom likes box that allows a user to like any post type from the front end.

WP likes vs Simple custom post likes