Yammer is a private social network for companies. The tool was originally for making companies and organizations more productive through the exchange of short frequent answers to one simple question: "What are you working on?" The Yammer API allows third-party developers to create their own Yammer applications.
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The Yammer SDK for Windows Phone is available to interact via mobile in enterprises, startups, and small businesses. This SDK permits users to login with the IE browser, access an authToken, and make calls to the Yammer API.