I actually wrote a tumblr post about that a while ago. It also included a user engagement aspect that would allow users to subscribe to topics of interest to receive a curated feed of changes that could each have a dialogue/poll emerge. I hadn't really thought through the specifics but its awesome to know that something like this is already started to some degree. Thanks for that!

Here's the post if interested.

http://proggr.tumblr.com/post/52801512630/githubberment