This a little out of control now. I am seeing the most horrid spam and noob uprising in my entire internet life. Polices need to be made, like now. I suggest you start with the editing of the user welcoming message: MediaWiki:Welcome-message-user.
Then, I suggest polices start being made with the addition to adding this: MediaWiki:Oasis-comments-header. Warnings and blocks need to be made. I am trusting with these two links, and this information, that the admins of this wiki will do their best to enforce the rules.