When it comes to the way a blog is written, there is a lot of variability. Some blogs are written in a very informal manner, while others are written in a much more formal tone.
Ultimately, the tone of the blog is up to the author.
Some people think that blogs written in a more formal tone are more credible and authoritative. This is because formal writing often uses specific terms and structures that make the information more easily understood.
In addition, formal writing often employs examples to illustrate points.
Overall, it seems that there is no definite answer as to how informal or formal a blog should be. Ultimately, the tone of the blog is up to the author and will be based on their individual style and writing preferences.