You could compromise and setup your own external site. e.g. I wrote https://github.com/skx/e-comments/ https://github.com/skx/e-comments/ for a static-site tha

You could compromise and setup your own external site. e.g. I wrote https://github.com/skx/e-comments/ https://github.com/skx/e-comments/ for a static-site that wanted comments. You could use something like that, then later bring it into the main app/site as required. The value here is that you own the data, not disqus, etc.