[htaunay]

This. Why on earth would an organization invest resources in a productivity tool which is by design optimized to make you procrastinate?

[Spooky23]

I’d never allow Facebook inside the firewall, but I did do a Yammer trial.

It was actually really cool, except nobody wanted to “own” the community, and eventually some assholes decided to be assholes and got it shut down.

[pmlnr]

See my sibling comment - "because people are familiar with it already".