re: Yammer And The Freemium Trap
I asked Wayne Shurts at Supervalu what he would have done if his CEO had instructed him to shut down the Yammer collaboration space, rather than embracing it. His response was that he would have tried to convince his CEO that was a bad idea.
Shurts said he understood what I termed the "allergic reaction" some organization might have to finding out their employees are active on on unsanctioned collaboration service. "That's why we quickly moved to pay for the service and have it all safe," he said. "My advice, rather than fight it would be to embrace it, You're never going to stop people from talking, or sharing ideas, so be smart about it and embrace it."
Doing so has led to a "much more open style of communication and transparent style of leadership" that has benefited the company.
From that perspective, the companies who seek to shut down a Yammer instance might be making a mistake. But we all have the right to make our own mistakes, and I don't think your company's standard response to organizations that want to opt out is winning you any friends.