Activity Streams (format)
Activity Streams is an open format specification for activity stream protocols, which are used to syndicate activities taken in social web applications and services, similar to those in Facebook's Newsfeed, FriendFeed, the Movable Type Action Streams plugin, etc.
See also 
- http://www.computerworld.com/action/article.do?command=viewArticleBasic&articleId=9132182&intsrc=news_ts_head Facebook opens activity streams; offers API to developers New Facebook app lets users see real-time streams running on desktops or cell phones
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