MLA week 2 blog or wiki?

I think of a blog as a diary or a current awareness list so you can easily keep current with the lastest items of interest. A wiki is more like a collection of articles on a single topic, whether it is broad or narrow. I think both have potential use in the library. I know that our library has been talking about starting a wiki as a place for staff notes. Right now, these are scattered across our front reference desk or in drawers.