Google launched OpenSocial, a set of APIs that leverage JavaScript and HTML for creating applications that access friends and update feeds from any compliant social network. Nearly 10 months later, Google is touting the maturation of the OpenSocial specification and growing developer and user adoption.

At this juncture OpenSocial version 0.7 has an addressable market of more than 300 million social network users, including the social networks that have delivered OpenSocial applications or are actively developing them, according to Joe Kraus, Google’s director of product management. Friendster, which claims 75 million users including 55 million in Asia, recently unleashed OpenSocial for its developer community. Hi5 has more than 1,800 OpenSocial-compliant applications and 66 million installations, according to platform architect Paul Lindner. Hi5 has nearly 60 million users, with 80 percent outside the U.S., according to ComScore.

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