I would like to propose that in order for someone to be able to participate on this message board, they have to actually be an active member on the site (i.e. writing reviews).  The primary purpose of this site, as I see it, is for people to be able to read and write reviews of various products, services, etc.  The message board is secondary.  On more than one occasion, I have seen someone post on the message board without having written a single review.  Evidently, these people are registering on the site for the sole purpose of using the message board for forwarding some kind of agenda.

I would like to suggest that in order for someone to be able to post on the message board, they must have written at least 5 reviews.  This is by no means a lofty requirement.  It should be just enough to discourage the above-mentioned people, while not really restricting those who are here for the right reason.