A quick summary:
The conceptual model of #ActivityPub resembles that of email: independent servers sending messages to each other.
The conceptual model of #ATProto resembles that of the web: independent sites publish data, and indexers aggregate this data into different views & apps." @laurenshof (2024)
https://fediversereport.com/a-conceptual-model-of-atproto-and-activitypub/

A conceptual model of ATProto and ActivityPub
If you were to design an open social networking protocol, what would that look like? Which metaphors and comparisons would you use to get a general idea of how the network functions? And what would you answer if people ask if your network is decentralised and federated?
