Social tools such as Facebook are very engrossing; companies are finding that their employees are spending more time on such sites, and in fact, they are getting banned in some companies because of the perceived impact on productivity. Given that Facebook allows a number of people to be able to view what you are doing (if you post), and if you are on the Friends list, you can get a good deal of information from the posts and also from the photos. Facebook is also being referred in divorce cases, since people post information without really thinking through the consequences, and such evidence is being used by courts to a large extent. In this case, the lady had claimed that she was suffering from migraine, and was too ill to be using a computer, not realizing that the company was tracking her updates, and they finally fired her (link to article):
A Swiss woman has lost her job after her employers spotted she was using the Facebook website when she had claimed to be too ill to use a computer. The unnamed woman was suffering a migraine and had told her employer, Nationale Suisse, she needed to lie in a darkened room.
But the company says it followed a simple logic: that those who are well enough to use Facebook with a migraine are well enough to work with a migraine.