The thought behind the idea is good, but, administration of it would be a nightmare. But, your question on liability would make it out of the question if it were my board.
Interesting discussion.
Reply to Scad:
***Legality...hmm, just thought of something else too. Right now, because of the laws governing internet postings, IHUB enjoys a certain "immunity" from prosecution
by Section 230 of the Communications Decency Act (CDA). IF, IF you start policing the boards now, where is that going to put you with regard to liability and responsibility for monitoring all posts and "enforcing" it. I think you might be asking for trouble there. Right now, you are protected.***