Just a quick note on a mistake I see people making.
Webcam covers are a cheap and easy way to prevent your laptop's camera from spying on you. But too many of the covers obscure the LED which indicates that the camera is on.
If you cover your activation LED then you won't be able to tell if a malicious entity has surreptitiously switched it on the camera. Keep it uncovered and you'll immediately notice if it is switched on without your permission.