Social Media usage in the consumer marketplace has had significant coverage. It is relatively new in the B2B space. Forrester conducted research using their social technographic ladder that categorizes people into 6 clusters according to their participation in social media, found that even in the B2B space there is significant participation in social media within the technology purchase space. They've created a tool that allows you to see the breakdown of their research results by company size and type of purchase.
In addition to the research results referenced above Laura Ramos at Forrester had a blog posting earlier this year and have a Slideshare presentation that you might find interesting.
If you are interested in further information on social media for B2B you might find the B2B Social Media blog of interest. There is also a LinkedIn Group on B2B Social Media that I've joined to continue learning how others are using social media tools in this space. Peter Kim has created a social media wiki that tracks companies use of social media in both B2B and B2C applications.






