Apparently there is miscommunication here.
The chat rooms I am talking of are the Gameday chat rooms linked to the Gameday feature used by MLB.com. The chat rooms ( not message boards, but live real time chat ) are actually created by Prospero, but their customer/tech support doesn't really exist ( there are e-mail or snail mail addresses, but they don't acknowledge that they even have received people's mail ), and MLB takes no responsibility for the chat rooms.
The spammer comes into the rooms and advertises the Fightingsioux.com and Siouxsports.com websites; it also claims that certain baseball franchises have signed an agreement for the spammer to provide updates on events for the fightingsioux ( I believe these agreements don't even exist ).
The bot tends to duplicate itself, it comes in as Siouxdome, spams, comes in again as Siouxdome_2, spams, Siouxdome leaves, Siouxdome_3 enters and spams, Siouxdome_2 leaves.....etc.