There are a number of tools that let you create shareable customized maps but very few of them allow users to carry out discussions around them. GeoTalk is a neat tool that lets you create map forums within a few seconds.
GeoTalk is powered by Google Maps and lets you create a customized map by focusing on any region of the world. You can even narrow it down to a single street if you want. Once you have created the map, type a question and click submit to create a forum powered by DISQUS. After you create the forum, you will be provided with a permanent URL that you can use to share the map-forum with friends. The forum allows users to post comments, rate them and even sort comments by popularity or time.
I’m thinking there are at least some creative uses for this tool (ie ARG, narratives, James Joyce etc …)