OpenSocial

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Google: Gadgets: OpenSocial

Overview
According to its directory entry at Google, OpenSocial is a set of APIs "for social applications across multiple websites. Using standard JavaScript and HTML, they enable developers to create apps that access a social network's friends and update feeds."

OpenSocial is part of the Google Gadgets code collection.

Official

 * home page
 * getting started: includes code editor with live preview feature