Board Thread:General Discussion/@comment-15305799-20140308040344/@comment-4018164-20140311114243

That's right, user blog comments are a separate namespace, and do not count as User namespace edits.

The main difference between user blogs and forum threads is that in the forum you have boards for different subjects and topics for "categorizing" a discussion, whereas a user blog is part of the user's personal spaces, where the posts are primarily listed under the given user's user blog, and it also offers using bloglisting. Here's a table with some differences between user blogs to forum threads: