For those like me who are out of the loop: * Webmentions are like pingbacks, but use a simple POST instead of an XMLRPC call; * They're not particularly new (

For those like me who are out of the loop: * Webmentions are like pingbacks, but use a simple POST instead of an XMLRPC call; * They're not particularly new (2013ish); * Webmention.io is a service to make it easier to participate in webmentions without operating your own POST endpoint.