What is critical mass for a discussion forum?

Hello,



I'm interested to know if anyone has any idea on how many users are generally needed to ensure a vibrant discussion? Clearly this is very subjective. However, I guess my thinking is that the majority will always lurk in the background, reading but not contributing. Hence for every 100 users you might only expect say 10 to actually participate.

If people have figures like this that they can share that would help me understand what size audience I might need to ensure an active discussion.



Please help

Thanks



I didn't find the right solution from the Internet





References:

forums.techsoup.org/cs/community

B2B Video Production Tips