Friendster, which has risen to become the largest social network in Asia after its precipitous fall in North America years ago, is today announcing  support for OpenSocial 0.7 as part of the Friendster Developer Program.

The Friendster app platform actually launched in late 2007 – it was the second social network to launch a platform after Facebook. Since then, thousands of developers have joined the Friendster Developer Program and about 500 apps have been released on the Friendster platform. Friendster told us today that 10 million unique users have installed at least 1 application so far, and half a million apps are installed every day. Of those who have installed applications, the average is between 2-3 apps installed per person.

Friendster’s Jeff Roberto says that the company will continue to support existing APIs as it adds OpenSocial support. “We plan to support both. This is really an extension of the Friendster Developer Program to developers of OpenSocial applications, who should now be able to run their apps on Friendster out of the box. We’re the only place that app developers can reach 55 million unique users in Asia on a single social network. And we have very low overlap with other social networks.”

Friendster’s platform as an open revenue model, meaning developers are free to monetize their apps however they like. One unique aspect to monetizing on the Friendster platform is that ads on the profile page are permitted – unlike other social networks.

“Friendster’s launch is another major milestone in the adoption and deployment of OpenSocial throughout the social web and around the world. We’re particularly excited that OpenSocial is helping Friendster bring new social applications to users in Asia, and we look forward to seeing users embrace these apps,” said David Glazer, director of engineering at Google.

Roberto says that while the company is not ready to announce specific dates yet, Friendster does plan on supporting the OpenSocial 0.8 spec. OpenSocial 0.8 adds REST API support – like the Facebook Platform does – something OpenSocial developers have been clamoring for for months.