You already know that laptops, desktop computers, tablets and mobile phones are all at risk of being hacked. But did you know that intruders might use the built-in camera to take surreptitious pictures and videos of you and your surroundings or hijack your microphone to eavesdrop on conversations?The latest story from the Edward Snowden leaks yesterday drives home that the NSA and its spy partners possess specialized tools for doing exactly that. According to The Intercept, the NSA uses a plug-in called GUMFISH to take over cameras on infected machines and snap photos.