On Thu, 2013-04-25 at 22:57 -0700, Alan Dayley wrote:
+AD4 What CMS would work well for such a thing? Is there something based on
+AD4 Drupal or another framework that can do this?

I'd look at status.net: http://status.net/

They have most of the features you're looking for already, and some
addons that are also useful.

Ted