Thursday, October 7, 2010 PubSubHubbub for YouTube Activities PubSubHubbub, for those not in the know, is a server-to-server protocol for notifying interested parties of events they’re interested in. Notifications are pushed out to subscribers via HTTP web hooks, which offers efficiencies over polling-based solutions. With PubSubHubbub, your server finds out about events in near real-time, without