Microsoft letting users choose Yammer as default social network in Office 365
 

Since enterprise-level social networking isn't really our bag, we haven't been paying that much attention to Yammer after Microsoft's paid $1.2 billion to buy it. Still, as part of Redmond's project to merge Twitter-for-business with Office 365, organizations can now make Yammer the primary sharing tool for their users. Unfortunately, we suspect some heavy-handed sysadmin will prevent you from sending those amusing LOLCat pictures your nephew emailed you to the folks in sector G.

http://www.engadget.com/2013/06/11/m... ign=Engadget