Final answer:
Jeremy Stoppelman and Russel Simmons are best described as entrepreneurs for creating Yelp, a platform which was a new business concept at the time.
Step-by-step explanation:
Jeremy Stoppelman and Russel Simmons, the founders of Yelp, introduced a novel business concept with their user-review-based platform. Given the information provided, they would best be described as entrepreneurs. As entrepreneurs, they identified a market need and took the risk to start a new business to address that need, showing innovation and a willingness to venture into uncharted business territories. This is characteristic of what entrepreneurship entails—a combination of risk-taking, innovation, and the management of a new business endeavor.