Seems like whenever you come back from a vacation there is something new being discussed that rocks your world. This time for it’s the PubSubHubbub protocol developed by Google Engineers.
A simple, open, server-to-server web-hook-based pubsub (publish/subscribe) protocol as an extension to Atom (and RSS).
Parties (servers) speaking the PubSubHubbub protocol can get near-instant notifications (via webhook callbacks) when a topic (feed URL) they’re interested in is updated.
The thing I like about this is in a “Feed WordPress” scenario. Instead of polling the same system a Hub Server could be polled taking some of the strain of the publishing WPMU server and also allowing faster content updates… I think Feed WordPress would need some changes but seems doable.
There is already a WordPress Plugin that supports the protocol…
PubSubHubbub Demo – Real-Time CrunchUp