The 5 mistakes outlined in this article are

1. "Ineffective contextualization" (not thinking about the best way to use blogs, usually self-reflection)
2. "Unclear Learning Outcomes"
3. "Misuse of the environment" (treating blogs like wikis or discussion forums)
4. "Illusive grading practices" (lacking clear rubrics)
5. "Inadequate time allocation" (both for students to write and instructors to grade and give feedback)