Lets try Webmention.
Webmention is a simple way to notify any URL when you mention it on your site. From the receiver's perspective, it's a way to request notifications when other sites mention it.
This spec written by Aaron Paretcki, this mechanism allows post comments on your site and mention it on another sites following POSSE principles, - Publish On Site, Syndicate Elsewhere.
in reply to:
Hi Aaron, thanks for Webmentions, trying out this guide to sending webmentions.