As indicated in other responses, the schools I work for do not allow a modification to the syllabus therefore adding a blog would give the students an added ungraded element, which will likely not be done. In one school we have weekly classes that are not graded, but are a fantastic way of getting great insights about the work and assignments for the week, but since there is no grade involved it is rare that I have more than 1 or 2 people show up. :-(
