Webmention is a web standard mechanism that allow bloggers to refer to each others posts, from one site to another. When you link to a website in a Item/Post, you can opt to send it a Webmention to notify it.

The protocol is implemented by many publishing platforms, b2evolution being one of them.

In b2evolution, Webmentions are controlled separately for:

• Sending outbound Webmentions
• Accepting inbound Webmentions

For more information about Webmentions, you can head on over to https://indieweb.org/Webmention.