Pubsubhubbub plugin for Joomla
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I don't know of any ... although I contribute heavily to the PubSubHubbub community. On the other hand, it should be fairly easy to create. There are a couple of Pinging modules like Easy Ping or Blog Ping (I haven't tested it though) that should be easy to unblock in order for PubSubHubbub to ping to hubs.
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