Today I found utterance in the comments section of a blog. Its looks like pretty simple to integrate and I trying it now.
All comments will create an issue at github.
When Utterances loads, the GitHub issue search API is used to find the issue associated with the page based on url, pathname or title. If we cannot find an issue that matches the page, no problem, utterances-bot will automatically create an issue the first time someone comments.
To comment, users must authorize the utterances app to post on their behalf using the GitHub OAuth flow. Alternatively, users can comment on the GitHub issue directly.