Yammer's first new release under the Microsoft umbrella has nothing to do with Microsoft. It's not about integrating with Sharepoint or Microsoft Dynamics. It's about changes to the Yammer platform and a new integration with HootSuite and a number of other third-party apps. The integrations show how the activity stream has emerged as a foundation for social network applications, allowing for third-party extensions and the capability to "pin" different feeds into the overall Yammer experience.