Main drawback of this approach is, the reader/aggregator will fetch the updates only at predefined intervals.
So, we can not read the content immediately even when the RSS feed is updated with the latest content.
PubSubHubbub protocol will handle this issue effectively.
This protocol uses an intermediate role hub between the publisher and the subscriber.
Refer the below screens/slides to understand this protocol.
Google Code blog says,
The protocol is decentralized and free. No company is at the center of this controlling it. Anybody can run a hub, or anybody can ping (publish) or subscribe using open hubs.
FeedBurner is supporting this PubSubHubbub protocol.
But you have to activate PingShot service in FeedBurner feed.
You can easily do it by going thro' Publicize->PingShot->Activate as shown in below screenshot.
We are running our below news services using FeedBurner along with Yahoo Pipes.
So this protocol is helping us to deliver the News as quickly.
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