These buttons resemble graphically the "like" and "do not like" social network, and have the same use.
In fact, with the Profile Ranking for CB we can express our preference on a profile by voting positively or negatively the profile of a user.
Each user can express a preference for maximum user, but can later change it by overwriting the original vote.
There are only two controls on Profile Ranking for CB, the first verification that only logged in users can vote, the second that a user does not vote himself.
For any malfunction, modification or ideas for improving Profile Ranking for Community Builder not hesitate to contact me!