Which if these categories and tools are you trying to use to drive your business?  Which ones are best to reach your target customers.  This is a good guide, but make your own company-specific conversation prism and see where it takes you.

Brian Solis and JESS3 have released v3.0 of The Conversation Prism for 2010.  The Conversation Prism is a great infographic showing the major players in each of 28 different online conversation categories.  The original 1.0 version from August 2008 (image available on Flickr) only had 22 categories, and some of those only had one player.