MASHABLE -- Mar 31 -- Hi5 launched a developer platform with support for OpenSocial. It is the first OpenSocial supporting network to offer a messaging API. According to hi5, more than 7,700 developers have registered to build applications on the site. Additionally, Hi5 has become a founding member of the OpenSocial Foundation, the non-profit organization announced last week between Google, Yahoo, and MySpace.
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