Hashtags with Octothorpes

An octothorpe is a distributed hashtag. When you octothorpe a link on your page, you're creating a relationship between your page and the linked URL — one that any OP server can track and surface alongside other pages pointing to the same URL.

This works exactly like a hashtag on a closed platform, except the index lives on an OP server rather than inside a single app. Any site registered with that server can participate, and multiple servers can federate their data together.

The core mechanic: add rel="octo:octothorpes" to any <a> or <link> element, and OP servers connected to your site will index that relationship.

More detail coming. For now, see Getting Started for a walkthrough of how to add your first octothorpes.