Through this post of Ernst-Jan Pfauth I learned about the Indieweb and webmention.
Creating this post with this link should be enough to show how this works. But to be a bit more clear I’ll paste a quote from their site to explain what is happening here:
When you post something on the web, it should belong to you, not a corporation. Too many companies have gone out of business and lost all of their users’ data. By joining the IndieWeb, your content stays yours and in your control.
Your articles and status messages can go to all services, not just one, allowing you to engage with everyone. Even replies and likes on other services can come back to your site so they’re all in one place.
You can post anything you want, in any format you want, with no one monitoring you. In addition, you share simple readable links such as example.com/ideas. These links are permanent and will always work.