I find many of the catagories are too general. If we could split them up so the discussions could be focused, such as you could have a General Politics catagory, and then one for Communism, or Capitalism, or whatever, then I think more posting would be encouraged.
As it is now, you have to click on a very general catagory and then sift through the current topics to find anything relevant to your interests, but the catagories are so broad that it's often unlikely. This, I think, discourages much posting in many catagories. (Maybe I'm just lazy?)