Yesterday an update was made to Autodesk Bluestreak that included the Revit Activity Stream application.
This connects Revit to Bluestreak cloud services to help distributed teams more effectively collaborate as they work on one model. It combines automated notifications of Revit worksharing events with informal team comments so team members can communicate when models are saved to central. It is also compatible with the newly released Revit Server.
You can read more here:

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