Curriculum, Community, and the Capacious Blog

At a minimum, blogs may be aesthetically pleasing and fluid course management systems.  But my interest here is in what I call the “capacious blog,” the ability of the multiuser course blog to contain all levels of discourse, to be both analysis and play or indeed to blur the lines between the two.  What is the relationship of such a blog to traditional course content and to formal assignments?  What is its relationship to the intellectual and embodied community of the humans in the classroom?  What is the pedagogical purpose of allowing or fostering a capacious blog?