High Quality Content by WIKIPEDIA articles! RSS Cloud is an extension to the RSS protocol that enables realtime (immediate) push notifications or distributed publish/subscribe communication for feeds. This is done using a cloud> element where more information is given on how a subscriber should request updates. RSS Cloud is not limited to RSS feeds but can also be used with other feed formats such as Atom. On September 7th 2009 WordPress became the first large supporter of the protocol, enabling the cloud> tag for over 7.5 million hosted blogs on WordPress.com .