Its my Dollar
Being a healthcare provider we dont have advertising, marketing etc so why would I ever want to give my staff a "tool" which diverts them from my business. Bewteen 8 and 5 its my dollar they are spending and I choose NOT to spend it on "Social Network" sites.
It seems to me that most of the proponents of this "must have" viewpoint are so far removed from the real world of public and private business that they have no idea of what it is like to run all or a part of a business. Lets face it we are (most of the world anyway) still in recessionary times and jobs are not plentiful so I dont even need to contemplate this to attract good applicants. If you think that sounds mercenary - it isnt - its just good business.