Paranoid much? Security-conscious Mark Zuckerberg covers his Macbook's camera and audio jack with pieces of tape. "Facebook CEO Mark Zuckerberg appears to be concerned about being spied on. A photo that he shared to help celebrate Instagram's 500 million monthly active users shows the camera and audio jack on the billionaire's Macbook covered with pieces of tape. In the photo posted on Tuesday, Zuckerberg is sporting a wide smile and his signature gray T-shirt and dark denim jeans. He's holding a life-sized Instagram frame that reads: 'Thanks to everyone in our community for helping us reach this milestone!'"