If you ever wanted to know what/why and how this real-time protocol called PubSubHubbub (aka PuSH) can get near-instant notifications (via WebHook callbacks) but can't stand to listen to another boring "social media expert" explain it in technobabble then this video is for you.
FYI: PubSubHubbub is a simple, open, server-to-server publish/subscribe protocol as an extension to Atom.
Related: Louis Gray on PubSubHubbub


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