A Forum is an area for chapter members to exchange ideas and opinions with each other. It, After appropriate review, a forum is generally an open, relatively free-wheeling area where anyone in the chapter can post their views on topics of interest to the rest of the chapter.
A Blog is for selected individuals (typically chapter officials) to share their take on issues with the rest of the chapter. Blogs are dependant on the officials to initiate the discussions about the topics...
