I think it is a good idea to clean up the stock boards from spammers. People keep reporting them and Yahoo just ignores. Even when you put these posters on mute you still see them posting by seeing "poster is muted" line . One example is the OXLC board. What's the point of "report" option when yahoo does not do anything about it. At the same time if someone post something little unusual then it gets rejected by yor AI. You probably going to ignore this as well :)