Originally, the MB was a place for everyone interested in the series. The MBers immediatly split into two main sides: SQ (led by Racoonwave4) and the Hystorians (originally led by AdventureBeliever5; after which the leadership repeatedly changed hands). There were a couple of people who claimed to be of external organizations (e.g. Mr. Holograph), none of which were confirmed.
The Hystorian Message Board has had several wars, mostly with the Spirit Animals Message Board, as they are polar opposites: The SAMB is unordered and crazy, and the IRMB is a slow, organized group of good friends.