@frank Webmentions are an extra generation or two beyond the traditional pingbacks/trackbacks. The receiver actually verifies that the sender is displaying the permalink on a physical page before accepting it, thereby cutting down on spam (there have been no reports of webmention spam in the wild yet.) Webmentions and their structure are also set up to allow the receiving site to better handle display which often includes the name, avatar, and either excerpts, or complete comment. I use them in WordPress and there's generally little if any difference in the display of Webmention replies and comments natively put into the system manually. Webmention also allows additonal types of mentions including likes, bookmarks, reads, listens, etc. to distinguish for context.