ActivityPub used by WriteFreely
ActivityPub is an open, decentralized social networking protocol based on Pump.io's ActivityPump protocol. It provides a client/server API for creating, updating, and deleting content, as well as a federated server-to-server API for delivering notifications and content.Notable implementations
Federated (server-to-server) protocol
Friendica, social networking software; implemented ActivityPub in version 2019.01.
Kbin, a news aggregator and discussion forum similar to Reddit and Lemmy.
Lemmy, software for running Reddit-style news aggregators and discussion forums. Any instance can use ActivityPub to interact with other forums and form a federated social network.
Libervia (in beta as of 2022)
Mastodon, social networking software; implemented ActivityPub in version 1.6 and released in September 2017. It is intended that ActivityPub offers more security for private messages than the previous OStatus protocol.
Micro.blog, a microblogging social network, added support for ActivityPub in 2018 and was enabled by default for new users in October 2022.
Nextcloud, a federated file-hosting service.
PeerTube, a federated video-streaming service.
Pixelfed, a federated image-sharing service resembling Instagram.
Pleroma, a lightweight fediverse server implementing ActivityPub since its first release.
WordPress via a plug-in to post blogs from users
WriteFreely, an open source and hosted blogging platform.See also
Activity Streams
Comparison of software and protocols for distributed social networking
Comparison of microblogging and similar services
Fediverse
MicropubReferences
Further reading
Pierce, David (2023-04-20). "Can ActivityPub save the internet?". The Verge. Retrieved 2023-04-21.