"The program, which Yelp is coordinating through the bug bounty platform HackerOne, is a public extension of a bug bounty system that Yelp has privately run for two years. The private version was open to dozens of researchers, who uncovered more than 100 vulnerabilities for Yelp and earned $65,160 in total, and focused primarily on Yelp's main website. Now, Yelp is inviting everyone to test Yelp sites and products. Yelp, which averages 73 million unique visitors to its desktop site and 63 million unique visitors on mobile each month, is asking hackers to cover broad ground -- the bug bounty program includes the company's main website, yelp.com, as well as its business-owners website, apps, reservation platform, corporate blogs, support center, and API."