Now, on to the stuff I did explore: Hubzilla a social media.
First: Hubzilla is really, really not a microblogging platform. It's probably better understood as a social blogging platform.
The major distinction here is that content on your stream is organized as posts. Replies to (or comments on) posts are grouped with the post, and can't be viewed as separate items.
The experience is similar to Facebook or Friendica, but the organization feels more "bloggy" to me.