I just dropped in at work when I was amazed to see this:-
For a while I thought perhaps this is just a tile , but I had also seen a message which was this:-
To my excitement, I couldnt resist to check the licensing tab but indeed now you could add Yammer as an individual license. This was something that many administrators were wanting since quite a long time. In the past it was way to difficult to control the yammer access, because yammer was enabled tenant wide and activation was applicable for everyone.This was an issue especially if people had temporary users or contactors who were a part of the tenant with yammer. Finally, we are able to see individual license assignment for it. Hope this helps enterprise social enabled organizations in a good way.