I’d been introduced to Fred Cavazza’s Social Media Landscape in early 2009, and recently had cause to revisit his material.  For those of you who attended a recent workshop I delivered, here’s the link you were promised:

http://www.fredcavazza.net/2010/12/14/social-media-landscape-2011/

Fascinatingly descriptive. (The evolution of change over the past 2-3 years is striking).

This is the current version (as of January 2011):