A common set of APIs from Google that seek to provide interoperability across social-networking applications. It provides developers with the ability to use HTML and Javascript (amongst others) to create client applications that are endowed with transparent access to social-network data such as: friends, activities by friends etc. The API is GData based, meaning it incorporates the Atom Publishing protocol for transport services and Atom feed format for data representation.

Benefits?

It provides some separation of Social-Networking application logic and actual Data.

Usage?

It is typically use to provide interoperability between social-networking platforms.

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Additional Information

Website: http://code.google.com/apis/opensocial/