@aaronpk Hi Aaron! Manton pointed me to webmention.io and I wondered if you would be able to clarify how/if I could use it within the limitations of a Wordpress.com-hosted site. Is that possible? Any help appreciated.
Do you have the ability to add custom HTML on wordpress.com? You'd need to be able to add the tag to your site's header, as described on https://webmention.io