ChinaCrowds is developed by Database Group, Department of Computer Science, Tsinghua University, Beijing, China, aiming to address machine-hard queries, e.g. labeling and translation. Requester can crowdsource their requirements, e.g., needed services, ideas, or content, and get answers from a large group of people, and especially from an online community, rather than from traditional employees or suppliers. Worker can make money by answering requesters's questions.