My colleagues and friends Arto and Dan have been talking about their very own PESH model (participant, enabler, supplier, helper) which helps brands map their usage, presence and possible/required measurements in their social media activities.
If you do social media marketing, it would definitely help you out to check those two posts. Definitely helps to get your ideas in order, as any good model should. 
Related posts:
- N2 Social Media Hub 3: Social media measurement I attended #n2hub last week and was originally planning to...
- N2 Social Media Hub 4 Was able to attend at least part of the N2...
- Own, bought, earned One of my colleagues posted online the model we’ve been...
- Nokia #SocialSummit Attended the Nokia Social Summit. The best set of notes...
- When is social networking too much? After reading this post by my good, very Genki friend,...