Again, we're okay with facebook/gchat/whatever. The rest of our employees are not engaged 100% of the time, and we're okay with that. This is not about spying on them, or making sure they have their nose to the grindstone for 8 straight hours. We have flexible hours, allow telecommuting, etc.
From my perspective, it's a cultural thing - we have tried to foster a two-way culture of openness and communication. We have 70 employees - 68 of which are okay with our environment of trust. What makes those two think they're special?