[nerdponx]

Never heard of WebSub before! Does this have some relevance to RSS and/or all those new hip "federated" decentralized sites? Or is it some kind of protocol for event-driven service architectures? Something else? I found a W3C standard for it, but it'd be nice to have a higher-level explanation.

[clone1018]

WebSub's biggest advantage from what I can tell is minimizing the load on the publishers. Instead of them having to manage webhooks to send out to, or having hundreds of thousands of clients polling them every minute, they can let a Hub do all the work for them.

Ably has a pretty good overview: https://ably.com/topic/websub (warning: sales article)