The Forest Map Wiki makes it easy to create maps.  It is particularly good for organizing people across wide geographic areas.  End users can add Organizations, Politicians, Events and other content types to the maps.  

The Forest Wiki is organized as a tree of Wiki pages.  A basic principal in human factors is that there should be no more than about 7 items in any category.  A map is two dimensional, so it does very well with about 49 categories (states), and maybe up to 200 markers.  In contrast many web sites support infinite lists.  Infinite lists are a human factors disaster. 

The Forest Map Wiki supports a hierarchical security model.

The site admin can grant a person edit permission on branches of the tree, and they can recursively grant edit permissions to child branches.

This model maps well to organization charts.

The Forest Wiki also makes it possible to edit the look and feel of your web sit e in the browser. It makes it easy to get started with your custom design, but it does not limit you.   I built multiple single page web applications on top of the Forest Wiki.