While it would unquestionably be spammy at a site this large, a possible side effect of its creation would be to reduce unnecessary spam on the actual forums. Which would probably please some or a great number of forum users.
I'm all for the idea, but not on this site. It would be way too busy and most of the posts would probably end up being requests for help in some Final Fantasy game, or something equally annoying.
But Leeza brings up the point of having to moderate it. I don't know about you guys but I would NOT want to have to sift through hundreds of posts every half an hour to make sure everybody was playing nice.