In a Mooc I do always blog.
It is because my texts and your comments are in one place here in this blog. We could read the history of this blog. Here I save your comments. With this blog We are connected with comments and tags and with pingback. In this way my blog is a map of my learning walk through moocs. In the blog as a map comments are highly valued places of connection to fellow participants and their blogs.
I do copy text from this blog to other places (in comments on blogs, on facebook, and in Google+.
I do like blogging more than Google+ because G+ is a chaotic mass of comments and texts. Slowly g+ is getting better.
With blogging we meet in smaller groups around the subjects we like. (In G+ we get lost because everyone is producing different texts that make us loose direction.
Teachers should encourage students to publish texts in a blog. A blog as a portfolio.