Not to worry, this is going to be another bust on the (increasingly large) list of Microsoft failures.
Work is to do work, not to pitter-patter around "social" tools. The only ones who think this is good are the people who earn money doing Powerpoint charts. They will be happy with it, for sure.
The rest of the grunts don't have time for social tools. They have a mountain of things to actually get done before the end of the day and if that doesn't happen, no amount of "social tooling" will avoid getting their ass fired.
So for once this is a Microsoft product that will clearly define its users : it will be the ones who consider themselves "deciders" and spend their time crowing about how good they are at it.
The rest of us will just suffer with Office in our dank cubicles and be grateful we get a check at the end of the month instead of a pink slip.