Great, so now people who don't want to sign away their privacy to a social network don't get a choice when their employer decides to mandate use of this company-wide.
This also pretty much forces you to merge your personal and work personas.
What? How? You'll have one account via your corporate email address (e.g. you@employer.com) and another via your personal email address (e.g. you@gmail.com)
This also pretty much forces you to merge your personal and work personas.