[doosra]

The big problem I see in the implementation of this idea: How does one forum handle the mass of users? I'm not talking about technical issues, more of the user experience. How can all users engage in the discussion without being overwhelmed?

[cjg]

Each user could pick how many other users they want in the forum. They would get a random sample of all the users. Not happy with the selection? Kick that person out of your forum and get another one from the pool automatically.