CrowdFlower

CrowdFlower is the world's leading crowdsourcing service, with over one billion tasks completed by five million contributors. CrowdFlower specialize in microtasking: distributing small, discrete tasks to many online contributors in assembly line fashion. Mathematicians, statisticians, cartographers, musicians, psychologists, entrepreneurs, information systems engineers. CrowdFlower's team is the best of the best with expertise in search relevance, content moderation, business data verification/correction, and more.