Recapping Yammer highlights and key takeaways from Ignite - Office Blogs

Apparently the new Office 365 Groups service is something of a collaboration chameleon; see Microsoft Office 365 Groups Overview and Roadmap (an Ignite conference session) for more details

"Some of you have asked how we think about the co-existence of Yammer and Office 365 Groups. To clarify, Office 365 Groups is an architectural element of Azure Active Directory—not an Office 365 app or experience—whereas Yammer is THE immersive social experience within Office 365. Together with identity, Office 365 Groups and Office Graph comprise a shared intelligent fabric across Office 365 that’s also extensible."

Recapping Yammer highlights and key takeaways from Ignite - Office Blogs