I see that there is an “optional tags” feature when creating new topics on these forums. However, there seems to be no “operational” optional tags to choose from to make use of this feature (yet). 
Allow me to propose some potential optional tags to enable for use:
- Druid
- Hunter
- Mage
- Paladin
- Priest
- Rogue
- Shaman
- Warlock
- Warrior
- Conversation
- Guide
- Guild
- Theorycrafting
I’m sure that others can be added, when/as necessary, but I’m thinking that these 13 ought to make for a decent starting point. 