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The web was built around a client to server architecture. It currently relies on “polling” pattern in which the clients have to ask the servers about the data they care about.
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PubSub for the web : PubSubHubbub, XMPP and Superfeedr
Julien Genestoux is the founder of Superfeedr.com. Superfeedr fetches and parses RSS or Atom feeds on behalf of its users and then pushes the new entries into the feeds. It is now the leading realtime feed provider on the web and hosts the vast major