In case you are not aware, webcams can be hacked and controlled without you even knowing. In this day and age, you really have to protect yourself. Software isn't always the solution, and sometimes a simple piece of tape is all you need. However, when you do want to use your webcam, you really don't want tape residue making the image bad, so enter the webcam sliders. There have been a lot of models made to date, but this one is by far the best I've seen thus far.
Each one is only 1 mm thick, and the opening is just slightly larger than a standard webcam. I believe they actually come in a few colors as well.
So if you are interested in keeping just a little more privacy, or are concerned that you might not have the level you think you have, you might want to get some of these.