I am taking my first online course this summer. I have designed online courses but never taken one before. (I know! Shame on me!) I am really enjoying the experience.
What I have noticed is that I am one of only 3 students in the course who is commenting on the posts of other students on the discussion board. The instructor continuously asks us to do that, but it isn't happening much.
Without a doubt it is easy for me to do because of blogging. Read what others write and comment on it -- What could be more natural?