Micro.blog is many different things all at the same time: it is a micro blogging platform. It is a place to micro blog, it is a blog host for both micro blogging and longform blogging. It is a photo blog. It is a microcast blog host. It is also a social network that acts as a bridge between the individual blogs. All your blog posts can be moved to Wordpress. Hosting on your own domain is encouraged. Micro.blog is not free but it also does not have any advertising. (Recommended.)
As a blogging platform, this is perfect for beginners. With Micro.blog you can post to Twitter but still retain control of all your posts on the blog. You can also write long form posts just as easily and they all get recorded on your blog. Additionally, you can can move all your posts to something like WordPress should you want to. Good for beginners who don't want to be bothered with complicated stuff. Recommend always using your own domain.