Question: What is the difference between a blog and a discussion group?
Answer:A blog features the ramblings, thoughts, tips, etc. of one person with comments contributed by people who come to the blog. A discussion group is essentially a place where any number of people can contribute to a discussion about some specific topic. One person might or might not control the contributions that are accepted in the discussion group, but the group is the contributor. In a blog, the individual is the primary contributor.
That is my short answer on that. -- John Kremer