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PubSubHubbub protocol, which turns feeds into real-time streams and recently Google Reader has started rolling out support for PubSubHubbub and readers like FriendFeed, Livedoor Reader (a feed reader popular in Japan), and FavIt already support PubSubHubbub

So what it means?

When you post in Blogger, your posts will surface in real time in Google Reader or other that support this protocol. Best of all, your blog is already broadcasting updates so you don't need to do anything to enable it, it will appears in real time in above readers. See the demo in the Embed Video.

All blog post feeds now contain a "hub" element, and will ping Google's hub on every post update. If you're a developer writing code to monitor feeds and want to get updates efficiently in near real-time, you just need to detect the hub link and subscribe to the hub server. Then, sit back and let the hub push updates to you.

Brad Fitzpatrick and Brett Slatkin who worked on a 20% project with the Blogger team to add this support



This is one of many features announced as part of Blogger's 10th birthday