Newsletter platform Ghost is the latest service to pledge support for ActivityPub, the open source protocol powering the fediverse. The company announced Monday it would add ActivityPub support later this year in a move that could bring tens of millions of people into the fediverse.

The fediverse is a growing collection of services, including Mastodon, Flipboard and Threads, that support the ActivityPub protocol. It’s part of a growing movement for decentralized social media services, which rely on open protocols rather than closed networks. Proponents often compare it to email, which allows people to communicate regardless of their preferred app or platform.

In a blog post laying out its vision, Ghost said it was joining the fediverse in an effort to “bring back” the open web. “On, Ghost publishers will be able to follow, like and interact with one another in the same way that you would normally do on a social network — but on your own website,” the company wrote. “The difference, of course, is that you’ll also be able to follow, like, and interact with users on Mastodon, Threads, Flipboard, Buttondown, WriteFreely, Tumblr, WordPress, PeerTube, Pixelfed… or any other platform that has adopted ActivityPub, too.”

While Ghost says ActivityPub integration will be optional for publishers, the company notes that its entry into the fediverse could bring “tens of millions” of new people into the space. A number of popular newsletters run on Ghost, including Platformer and She’s a Beast, as does the independent tech news site 404 Media.

Correction May 1, 2024, 6:50 PM ET: A previous version incorrectly stated that the Garbage Day newsletter runs on Ghost. We regret the error.

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