Do you think that you could chair a board without bias?
If I started a thread to discuss the merits of XYZ private company, should I only allow the type of input that I support? (you stated that it should only be about public companies)
Policing of Public Threads about Public Companies, is something that should be done properly without bias to one or the other.
Private threads that deal with more general topics should be more at the discretion of the Chairperson, KNOWING that if not patrolled properly, THAT THREAD WILL NOT THRIVE! or will be limited to the few that want to conform!