The OpenSocial technology has been adopted by a number of consumer and enterprise social networking providers and its development is managed and overseen by the nonprofit OpenSocial Foundation.

When asked about plans to let developers build Google+ applications using the OpenSocial APIs, a Google spokeswoman said via email that at this time the Google+ platform doesn't support the OpenSocial APIs.

"However, we are using lots of the technology that was developed as part of OpenSocial, including the gadget application packaging model, and the Portable Contacts JSON schema, to power Google+ games. As we define the +Platform APIs, we are paying close attention to the future direction of the OpenSocial APIs, and converging wherever possible," she said.

Developers can use the OpenSocial APIs to build applications for other Google sites and services, including the Orkut social networking site and the iGoogle personalized home page service.

Google+ was launched in June in trial mode and remains available by invitation only from Google and existing members. It's estimated that about 25 million people have Google+ accounts.