Yelp CEO Jeremy Stoppelman is on a serious roll. While second-quarter revenue rose 69 percent year over year, the nine-year-old social review site is expanding in myriad ways. Yelp just launched a mobile app that lets users post from their smartphones as well as a food-delivery service. It also acquired software that lets you make restaurant reservations. And with European traffic soaring, Stoppelman now has his sights set on Latin America and Asia. Always opinionated, Stoppelman spoke frankly about the company’s expansion plans—and didn’t hold back on his own review of a certain rival.