PubSubHubbub. Say that three times fast. If you're not familiar with PubSubHubbub, it's an extension of the RSS and Atom protocol that allows the feed to push content out when it's updated. That's just the sort of technology we should see from check-in APIs like Foursquare and Gowalla.
This tutorial shows you how to create a free email alert feed using the Webhose.io API and MailChimp. We’ll start with a basic query to monitor content mentioning Donald Trump. Then we’ll add some filtering parameters to the API query and show how to plug the API URL into a MailChimp RSS campaign.
There are a number of ways of delivering data in real-time but until recently it has looked like PubSubHubbub, with the backing of Google, was going to be the preferred method. However, the past couple of weeks have seen a couple of interesting developments which could indicate that the developer community may actually prefer HTTP Streaming.