Guest post by Ashley Furness of Software Advice When Microsoft announced plans to buy enterprise social network Yammer recently I was a little stunned. The reported $1.2-billion acquisition price tag seemed like a lot for simply replicating social networking functions in the business environment. Would companies really achieve ROI? Or would it be more of a “distraction,” as one user told me? Still, Chatter Product Marketing Director Dave King told me in a recent conversation that “social is more than…