Is the design of other users' webmention displays the only part that confuses you or is there something else? If that's the only thing, it seems like webmentions solve the problem of community building for you. Since it's your site, you get to decide if you display them and how. You could choose not to display likes/reposts but to display replies like a comment thread.
There aren't any comments on this post yet. To comment, publish your reply online and send a webmention.