Google’s open social networking platform play is the buzz of the blogosphere tonight. Indeed, it is called OpenSocial in that the set of APIs allows developers to create applications that work on any social network that joins Google’s open party. So far, besides Google’s Orkut social net, LinkedIn, hi5, XING, Friendster, Plaxo and Ning have joined the party.

Oracle and salesforce.com are also supporting Google’s OpenSocial efforts, which indicates that they have plans to add social networking elements to their application platforms. OpenSocial will officially launch on Thursday.

Plaxo emailed a statement about OpenSocial this evening, getting ahead of the stampede:

“Dynamic profiles redefine what users should expect in terms of how they can represent themselves in a social or business network,” said Todd Masonis, Co-Founder and VP of Products for Plaxo. “We believe that users should have full control over what they share with whom – and that the catalog of widgets that they can choose from should be as open and diverse as the web itself. We are excited to support in dynamic profiles any application written to Google’s just–launched OpenSocial APIs. ”

According to TechCrunch, which first reported on Google’s larger social networking ambitions, OpenSocial consists of APIs for profile information, friend information (social graph) and activities, such as a news feed. OpenSocial users Javascript and HTML rather than a markup language as Facebook does.

This comes on the heels of the Facebook’s dynamic growth based on opening its social graph to developers and Microsoft’s $240 million investment for 1.6 percent of the company. However, unlike Google, Facebook doesn’t open its APIs to support other social networks. The other social networking giant, MySpace, is also planning to open its platform to developers.

This openness is part of what Vic Gundotra, Google’s head of developer programs, meant when he said last week, “In the next year we will make a series of announcements and spend hundreds of millions on innovations and giving them away as open source.”

He explained the newfound openness as more than altruism: “It also makes good economic sense. The more applications, the more usage. More users means more searches. And, more searches means more revenue for Google. The goal is to grow the overall market, not just to increase market share.”

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