The eternal debate: Should Facebook be turned on (or off) in the office?

HR Bartender’s Sharlyn Lauby: If a billion people are using Facebook, what percentage of your company’s employees are on Facebook? 50%? 75%? 90%? Is it possible that the number is 100%? From a practical standpoint, how does a company successfully manage keeping it out of the workplace? Yes, it’s easy to draft a “no Facebook” policy. But how do you really keep it out?