Communities, that is particular cities, would be the next subject in the list, but i'm going to put this off a little until I have specific communities to examine.
Social structure and change is also appropriate, but the applications of other areas doesn't advance the subject much at the current state of development.
Social change ought to be informed by the whole range of human history and particular societies, but I need discussion of particular changes, social types, and structure before I can discuss this in enough detail.
Particular changes is not yet well enough connected to be very useful yet.
Social types are better connected to other areas, but not yet subdivided much.
Social structure is also in the fairly early stages of examination.