Visual frameworks which make sense of the variety of activity in social computing, can help marketers think more strategically about which tools to use.
The popular Twitterverse by Brian Solis and JESS3 is busy, but interesting.
Jan Mirius has put together a one page view of the roles of different types of social media sites. Jan was an Icon Added Value / AVNA consultant for 8 years who is now founding a social media startup, uNapse. He is self described as having one leg in Munich, Germany and one in Brooklyn NY.
Cheskin Added Value put together a visual framework to explain the different functions of social computing last year, and then layered a few sites on top.
We also put together a framework to categorize social search sites.