As still one other alternative, you can have a blog in Moodle, which is then not publicly available. Truthfully, this is much less convenient than the other alternatives. But it protects your privacy the most because the the rest of the world doesn't have access to the Moodle class site. If you want to pursue this alternative you must contact me about it. I have to set it up for you.
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The instructions below and in the next post are aimed at setting up your blog so that you post under your alias - nobody outside the class will know who you are - and make sure that everybody understands this is a blog of a student, not of the person from whom the alias was constructed.
The video below was made for the class from two years ago. It is applicable still, though Blogger has changed a bit since. Also note, that it assumes you are making a new Gmail account just for this use. As an alternative, you can use your non-university Gmail account equally well, if you are not already using Blogger with it.
The main thing is to use the Blogger Profile, not the Google Plus profile. The Blogger Profile is what allows you to post under an alias. See the image below.