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How does this compare to ActivityPub used by Mastodon et al?

• erikrothoff 8y ago
  See it more as an alternative to RSS. Aggregators subscribe and feed information to their users. The polling step is just switched to pushing.
  • detaro 8y ago
    Not really an alternative, more of an addition to. The most common use case for Pubsubhubbub/WebSub is in combination with RSS/Atom feeds, informing subscribers about updates to those.
• tscs37 8y ago
  It's part of the Social Group at W3C IIRC. WebSub solves problems around RSS, notably that clients have to poll a lot and smaller sites thusly need to maintain those requests. WebSub solves that by designating a hub that can handle this instead. Ie, you federate your blog feed to elsewhere. ActivityPub fills another niche, mostly everything around human interaction in social networks. WebSub could be used to feed data into ActivityPub networks.
• Communitivity 8y ago
  After reading the responses I don't see yet why the non-transport bits of WebSub can't be done with ActivityStreams and ActivityPub. That said, I haven't put the kind of time into it like the W3C Social Group has, nor am I recognized expert on it, so I'll hold further comment until I can finish and publish to Show HN a related proof-of-concept involving Peer-to-Peer topic based publish/subscribe using ActivityPub, that I've had on the back-burner for a while.