Finally, after dozens of wpDiscuz users requests, we’re releasing the Advanced Likers addon. This is a light solution for people who want to display comment likers list and encourage commenters with some reputation titles and badges. wpDiscuz Advanced Likers addon opens a pop-up window with all voters/likes of current comment. You can see positive and negative voters separately. The light user reputation system allows displaying different rating titles and badges based on the amount of received likes.
BuddyPress Friendship Restrictions plugin allows you to restrict BuddyPress Friendship