Thanks to Mathemagenic for leading me to this page at CommunityWiki which points out how communities are often defined/tied to one technology and why. This is something I had kind of been thinking of all along, but the text spurred me to do something I've been meaning to all along: remove the story and forum modules from Kairosnews. All of the posts via stories and forums have now been converted to blogs. Communities, I think, don't do as well--unless they are significantly large and/or active (thinking of the open source exception mentioned in the text)--when the discourse is distributed across too many different communication technologies. Or perhaps its too many different virtual places?