Hi Tim! I absolutely think you can use your coetail blog as a professional portfolio. When I was job searching last year I included a link to my blog (I was blogging before coetail). My other blog is a wordpress blog. When coetail is done I will probably combine the two (I have currently set them up to look the same). Here are my thoughts on teachers creating a professional online presences – https://goo.gl/t6RGI.