I wan't to create a Knowledge Base or Wiki in Odoo v8. But more or less It's a closed book to me how to do.

I have installed the dosument, knowledge base and the blog module. And I have created some blogs as a superadmin (only this user can do so).
Then I was able to create a post in the frontend (website) with some text and a empty one (only title and subtitle) from the backend.
But this is not what I'm looking for. Could it be that there is nothing as Wiki page (collaborative editable text creation) in odoo?
Has mybe somebody a workaround for this?

And I want to edit my pages rather in the backend as in the frontent (website) and I want to keep it internal for certain cateories.