Facebook in the hospital
For whatever reason, Boston nurses love Facebook. Maybe elsewhere too. Especially at night. If you go to a night ward or even the ICU at night, there's a bunch of nurses on Facebook.
Also, residents and interns have pagers, which nurses use to get a hold of them. But nurses don't have pagers, and sometimes it's hard to track a nurse down.
So it was inevitable that someone would think of it. Right now it's a joke told by one resident to another: "I'm going to start using Facebook to page nurses."
Soon it will be a Facebook app which will spread like wildfire through the hospitals.