Hi Jolly, As you mention there can be different uses for each of these tools. If a blog is used as a self reflection journal to provide students with a personal learning space, then it would need to be set up accordingly and not as much moderated as, however, supported through comments etc. If either tool is being used to support direct content of a course, then yes, the moderator should have content expertise. If either is being used as a project tool then it would again be set up differently with different expectations and with time lines. Everything, as always, depends on the outcomes...