Apparently Yammer has been name the Leader in Activities Streams by Forrester Research Inc., in a new May 2012 report: "The Forrester Wave™: Activities Streams, Q2 2012." Yammer received the highest scores for its current offering and was ranked among the highest scores in 16 out of 19 criteria, including adoption strategy and market presence with more than 5 million users.
If you don't know about Yammer -- the tool drives company-wide collaboration -- uniting teams, empowering mobile workers and giving executives unprecedented visibility into their organizations. hEmployees across geographies and departments can share and discover information, content and ideas, rapidly get questions answered and collaborate more effectively on team projects.
Yammer integrates with a broad range of business applications such as Microsoft Dynamics, Microsoft SharePoint, Salesforce.com and SAP, making it easier for workers to discover, share and act on relevant information within those systems to move business objectives forward. Offering access points from mobile devices, web browsers, desktops and within other business software, Yammer has the flexibility to deliver social functionality wherever employees are working.