I heard about that in the 0.5.5 thread Talad posted but I don't really understand this whole confusing thing RlyDontKnow is talking about

Well to me I would of thought that any book placed on the message board was automatically locked in, a message is then sent to a GM who then can check if the message is allowed to stay. The message will simple say (Probably in the petition window) "[Player name] has placed [name of book] on [town name] message board." GMs being able to spawn, can simple spawn to the message board, take a look at the message, and tick the book off the petition window if they think it is acceptable.
Or the devs can go hard out and copy the book that was placed on the message board into the GMs petition window (I am guessing it will be in the petition window but will be kinda like the Quest window how you choose Events and Quests. Normal petitions and Message Boards).