@w4rner On the Webmention.app/IFTTT front, that description is a set up for services that don't send/receive webmentions themselves. Every time you publish something on micro.blog with a URL, micro.blog is sending webmentions out for you in the background automatically.

If you had a Tumblr website and wanted to send webmentions, then you might use that Webmention.app/IFTTT set up so that when you posted something on Tumblr, your RSS feed would update with the new post, IFTTT would check the update and trigger webmention.app to send a webmention from your post to any of the URLs that appeared in your post.