I've always covered the camera. I dont do facetime or similar, never have, but in the early days set off the camera accidentally, to the amusement of friends. Since then, though, a strip of semi opaque tape, like leucopor or whatever its currently called, does the job. If someone wants to look, they can, but they will only get blurred colour. And because i have a white macbook, you cant even really see the tape because its white also.