Besides a Twitter-style microblogging app, atproto could also be used to implement Reddit-style forums, long-form blogs with comments, or social applications - link sharing, book reviews etc. The same user identity, social graph, and user data storage servers can be shared between all of these apps.

Goal is to offer an open and diverse marketplace of algorithms in which communities can adapt the system to suit their needs, and users have more agency over how they spend their time and attention.

Researchers can construct an algorithm to label suspected disinformation, they can publish their labels in real time, and users who wish to see those labels can enable them in their client.

Fediverse -- collection of social media services that can communicate with each other using a common (ActivityPub) protocol.

Other popular decentralized social networks — fediverse around the ActivityPub protocol and the Mastodon software.

Bluesky, launched in Feb 2023, is a new social network built upon the AT Protocol, designed such that for every part of the system there can be multiple competing operators providing interoperable services, making it easy to switch providers e.g. moderation services.