Creator: Franz Wirl
OpenSocial is a set of common application programming interfaces (APIs) for web-based social network applications, developed by Google along with MySpace and a number of other social networks.
It was released November 1, 2007. Applications implementing the OpenSocial APIs will be interoperable with any social network system that supports them, including features on sites such as Hi5.com, MySpace, orkut, Netlog, Sonico.com, Friendster, Ning and Yahoo!.
The web is better when it's social
The web is more interesting when you can build apps that easily interact with your friends and colleagues. But with the trend towards more social applications also comes a growing list of site-specific APIs that developers must learn.
Many sites, one API
A common API means you have less to learn to build for multiple websites. OpenSocial is currently being developed by a broad set of members of the web community. The ultimate goal is for any social website to be able to implement the API and host 3rd party social applications. There are many websites that support OpenSocial, including hi5, LinkedIn, MySpace, Netlog, Ning, orkut, and Yahoo! Check out the full list of OpenSocial containers at http://wiki.opensocial.org/index.php?title=Main_Page#Container_Information