Here is a video describing the power of webmentions in #edu5222. My students are amazed that they do all their learning from their own domain but their replies show up on each other’s post and our rss feed magically slurps up everything they write. One thing to note you don’t need a reply post-kind for your webmention to work. You can just mention somebody’s url in you post or or link to a specific page or post on their website in any post-kind at it will work as well.