During one of the sessions, I heard someone mention the 90-10-1 rule. Meaning that in communities 90% of users will lurk 10% may comment and only 1% will actively contribute by starting discussions. (OK I know that adds up to 101%) What's your feeling on this rule? How does this compare to the activity in your communities?
It actually reflects our experience pretty accurately - and we are a membership organization so should be pre-disposed to a "higher than normal" participation (in my opinion).
I think we will eventually exceed these numbers but I think they are a good rule of thumb as a starting point for most organizations.