Although some people argue that Twitter is one more distraction in a tech-saturated world, David Cosand says it's been a time-saver for him. He was writing a grant proposal recently to buy more technology for his school and realized he needed to learn more about document cameras. "I put a tweet out asking people which cameras they have found useful. In half an hour, I got great feedback from all over the country," he says, and he wound up narrowing down the list to an AVerVision CP300 model.