If your use of blogging is going to be limited to just distributing information about your class(es) to students and their parents, one blog is all that you need. Even if you teach multiple courses, one blog is sufficient if you’re only using it to distribute information. Simply label each new blog post with the name or section of the course for whom the information is intended. From a management standpoint it is far easier to label each blog post on one blog than it is to maintain a different blog for each course that you teach. That is a lesson that took me one semester to learn.
In regards to students, for a single class Byrnes recommends a group approach:
The solution that I recommend is to create a group blog for each class that you teach. Create the blog using whichever platform you like then make each student an author on the blog. To track who wrote what on the blog make sure that the author’s name (first names only or use pen names with young students). Alternatively, you can have students label or tag posts with their names or pen names to sort out who wrote what. As the creator and owner of the group blog you will be able to see who wrote what from your administrative panel, but that doesn’t help parents who want to check the blog to see what their children have been sharing.
While if you have 25+ students in a class then use something like Feedly to manage blogs. My question about this approach is that it assumes that the blogs are private. If you use Campus Press (Global2) then there are other built-in options.
Although I have blogged about my own experiences and Kathleen Morris wrote an extensive post capturing an array of possibilities, I think that it is always useful to stop and consider other perspectives.