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@evan @atomicpoet
It appears that PubSubHubbub became WebSub at the W3C. @Julien51 can probably tell us more.

Something like WebSub, as a service to those who explicitly want their ActivityPub content to be indexed, would be a useful function for a server to provide. Such a system should dramatically reduce the cost of discovery and polling -- which is, of course, why PubSubHubbub was created in the first place as an advance beyond the old FeedMesh.

https://www.w3.org/TR/websub/