Readers should be able to respond to a blog post via post on their own blog.
Towards a Commenting System blog post.
Generic: provide a basic editor on Remark.as that can publish to WriteFreely blog, Ghost, Tumblr, etc. but notifies via reply protocols like Webmention. TODO: explore viability.
Specific: publish to Write.as blog, reply via ActivityPub.
Provide this navigation option alongside private option (T752).