Considering Google+ in a big-picture communication/collaboration framework

The diagram below captures a framework for explaining how the myriad communication and collaboration services currently considered aspects of “social business” fit together. 

At this point, Google+, with its user experience/conceptual model focus on circles and streams, is primarily an asynchronous communication tool (along with some sync/comm capabilities, in huddles, and sync/collab capabilities, in hangouts), but, as suggested in my previous post, we should assume the scope of Google+ will be expanded to include async collab (workspaces, e.g., Google Sites) as well, and at that point Google+ will become a more direct competitor to traditional collaboration products/services such as Microsoft SharePoint