Haha, sorry for the in-line links! I was thinking of tag-reply posts from the receiving side, as a way of letting others suggest tags for your posts. Readers of your comics post tag-replies on their site, your site would receive them as webmentions and you could add them to the comic post or not.
It’s all IndieWeb building blocks, but it’s a lot of plumbing on your side (accepting webmention data into your tags, moderating) and theirs (making a post on their own site with markup, sending webmentions).
Don’t apologize for the inline links, I could have just not added them. ;)
And okay, I understand what you’re getting at now! Yeah that seems like a possible way to do things although it’s a lot of setup for a lot of people and I like to use the principle of least effort for things like this.
Also this has inspired me to make a subcategory for the blog for conversational threads. I wonder if the webmentions will end up getting re-sent to the previous entry on this new category. I also wonder if I should set up a rule on my Atom feed to let people filter out posts like these.