ActivityPub is the backbone of the Fediverse. Implementing this protocol will allow one to interact with users on Mastodon, Pixelfed, Friendica, and others. Unfortunately for a static website, this protocol uses a publish-subscribe pattern. A service would need to be written in order to handle subscribers, pushing messages of published items, as well as receiving mentions. At the current state of my website, I am uninterested in creating such a service.