an extension to the Atom feed format to express what people are doing around web
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The Activity Streams format has already been adopted by Facebook, MySpace, Windows Live, Opera, and many others.
Draft specs: Activities in Atom; Activity Schema; Atom Media.
The Cliqset FeedProxy converts 70 typical RSS and Atom feeds from popular social networks to support the Activity Streams format.
An initiative from the Diso Project. Background.