This plugin provides 4 new template tags to display some informations/actions about posts and comments. This template tags have to be called within the loop :
wp_postlike(); : Return a link to like or unlike a post
wp_commentlike(); : Return a link to like or unlike a comment
wp_nb_postlike(); : Return a text to display the number of like for the current post
wp_nb_commentlike(); : Return a text to display the number of like for the current comment