Wiki plugin (not lite version) "Discussion" tab, what's it supposed to do anyway?

What is the tab "Discussion" for? It doesn't do anything, when I test it from both an admin level and a regular sign-up level it's just a big blank nothingness. Can this be fixed so it does something or will I have to hack it out? I would much prefer to keep it in for whatever pupose it is supposed to do.

Thanks

Screenshot attached: