A blog post needs to have a storyline. A blog post needs to have a storyline! This is what I was taught in school. Not so much about a blog but more about dissertations. It still rings true. Writing about anything without a storyline presents the danger of boring your audience. I can still hear my teacher in Dutch language hammering that into our heads.
Nowadays I write in English, Dutch seems to be far away. However, my teacher is still right about one thing. A dissertation or even a blog post should have a storyline.