Software Engineering Radio - the podcast for professional software developers SE Radio 657: Hong Minhee on ActivityPub and the Fediverse
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Feb 27, 2025 Hong Minhee, an open source developer behind the Fedify ActivityPub library, dives into the intricacies of the ActivityPub protocol and the expansive Fediverse. They discuss the fascinating interoperability of microblogging apps like Mastodon and Threads and the challenges these platforms face. The conversation also covers the complexities of JSON-LD, the semantic web’s role in improving data accessibility, and innovations for decentralized messaging. Finally, Minhee highlights the vibrant development community in Asia and practical applications of Fedify in app development.
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ActivityPub and the Fediverse
- ActivityPub, a W3C-recommended protocol, enables interoperability between social networks in the Fediverse.
- Mastodon, Misskey, PixelFed, Lemmy, and even Meta's Threads are examples of platforms using ActivityPub.
Meta's Threads and ActivityPub
- Meta's Threads implementation of ActivityPub is currently one-way, allowing other Fediverse platforms to follow Threads users.
- However, Threads users cannot yet follow accounts on other platforms.
Fediverse Interactions
- In the Fediverse, users, known as "actors," interact through "activities" like Create, Follow, Like, and Undo.
- Different platforms translate these activities into their own features; for instance, Lemmy uses Like for upvoting and Dislike for downvoting.