OpenSocial

The main aim of OpenSocial is to define a common API for social applications across multiple websites. Using standard JavaScript and HTML, developers can create applications that access a social network's friends and feeds. Applications that use the OpenSocial APIs can be embedded within a social network itself or access a site's social data from anywhere on the web. OpenSocial applications are based on Google gadgets technology, and gadgets have been standardised as part of the OpenSocial effort. The Atlassian Gadgets framework is based on version 0.8 of the gadget specification from OpenSocial, but does not currently support other parts of OpenSocial, such as the social data or web service APIs.