Should I use Yammer or SharePoint social feeds?
Microsoft's current social media and business collaboration strategy largely revolves around Yammer. After purchasing Yammer in 2012, Microsoft has been steadily integrating Yammer into the SharePoint platform. The company will not be adding any new social capabilities to SharePoint and is instead focusing its efforts in this area on Yammer.
For this reason - and because Yammer provides a rich, unified and familiar social media experience - we recommend that SharePoint users embrace Yammer rather than use SharePoint social feeds.