Distributed Cache Service: SharePoint 2013 social architecture and related features rely heavily on my sites data as well as the distributed cache service which provides for: Two lists, the Microfeed list and the Social List Personal site document libraries Profile database The Distributed Cache service, which is built on top of the Windows Server AppFabric Cache , provides caching functionality to features and services in SharePoint Server 2013
Between development of SharePoint 2013 social features and the acquisition of Yammer, Microsoft has shown that they are serious about addressing the changing way in which we work, and improving the ability of our intranets, extranets, and external-facing websites to surface the right content, at the right time