PubSubHubbub, Feeds, and the Feed API- Google Developers Blog
Jul 1, 2013

Summary
This post announces the deprecation of the Google Feed API and the transition to PubSubHubbub for real-time feed updates. It highlights PubSubHubbub as a more efficient and scalable protocol for syndication, enabling instant notifications of feed changes. The post also mentions the continued availability of the Google Feed API for fetching feed data, but emphasizes PubSubHubbub for real-time delivery.
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