Observed on one of my student's laptop. He told me that he "did not want to be observed" (nor he wanted his laptop to be controlled from elsewhere). Which is why he he put a (French) stamp ("easy to remove", he told me) on the camera.
Why do I blog this? This is an interesting example of these little signs of how users try to reclaim a form of control on digital technology. Even if the laptop has a LED that indicates whether the webcam is working on not, this user prefers to have a better control on this device.