SPYam is a great example of a non-Microsoft hosted Yammer network dedicated to the SharePoint and Yammer customer base.

Following up on our review of the Social Features that are currently available within SharePoint 2013, let's highlight some of the features available within Yammer.

In fact, the opposite - Joel Oleson (number one on the list this year) created a public facing micro-community on Yammer called SPYam to discuss and support SharePoint and Yammer.