Sadly, I'm not sure if a pinned thread reminding players of the Naming & Shaming rule would really help. We've already got two pinned threads detailing rules and general guidelines for Player Behavior, as well as the Boards Universal Rules in boldface and with a scroll icon on the left, just a little ways under the "Create a Discussion" button, so if people aren't bothering to read all of that, I'm doubtful that a third reminder that players aren't allowed to name & shame would really do anything.
If they're not willing to bother to read the rules in the first place, making more threads to explain the rules probably wouldn't get very far.