This is very cool. In case you missed it PubSubHubbub is a way for you to receive near-instant notifications of change updates to a PubSubHubbub enabled RSS/Atom feed. So, the moment a new post appears on a blog for example, you’ll receive instant notifications in PubSubHubHub supported applications (eg. lazyfeed.com). When XMPP support in Google App Engine [...]

Source : Fleck.com Blog (subscribe)

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