What is the difference between a blog and a newsgroup?

Recently in a conversation I was asked to comment on what really was the big difference between a blog and a newsgroup.

After all they are both a reverse chronological list of postings, right?

My answer, maybe obvious, is this: a newsgroup is (typically) focused on a certain subject matter, and has many different people posting their comments and questions on that topic. So you follow a newsgroup because you are interested in a specific subject matter.

A blog is (typically) focused on a certain author's voice, and often covers many different topics, of interest to the author. So you follow a blog because you are interested in a particular author's point of view.

Of course in reality it's not quite that black and white, and there are shades of grey in between.
Posted on December 30, 2004 and filed under Blogs.