#ATProtocol refers to a specific protocol or set of rules designed for communication and interaction on the internet.

#ActivityPub, on the other hand, is a real protocol. It's a decentralized social networking protocol that enables different social media platforms to communicate with each other. It's often used in the context of federated social networks, where multiple servers and services can interact and share content in a standardized way.

@jjdavis #twitterdeathchallenge