If you have a GitHub account you can now comment on https://recog.io. Initially using disqus but turned off by the ads, I decided to find a better (ad-free) way to add comments. That is when I remembered this neat project Utterance, which uses GitHub issues for comments. The public repo used is System-Kraken/recog-comments.
I thought since most of the posts here are developer/tech focused, needing a GitHub account to comment would be the best middle ground.