Using the underlying power of GitHub, blog authors often take a step further and roll their own discussion and commeting systems.
The best examples are:
- Add a comment by sending a pull request by Mark Seemann
- Add a comment through the GitHub API by Ivan Zuzak
- Add a comment as a GitHub issue by Zach Holman
With the evolution of blog-aware static site generators, like Jekyll, GitHub is becoming a central part for hosting both blog content and comments.