Holly tweets every time someone at the Nottingham Hackspace in Nottingham, Britain, buys something from the vending machine. But Holly, counter her deceivingly humanoid name, is not some weird, passive-aggressive person tweet-shaming her colleagues about their snack choices. “She” is a computer server — and thanks to an ingenious hack by James Fowkes, she not only knows who buys snacks, but what they bought, when they bought it and how much they paid.