In 2004, Levchin founded Slide, a personal media-sharing service for social networking sites such as Myspace and Facebook. Slide was sold to Google in August 2010 for $182 million and, on August 25, Levchin joined the company as vice president of engineering. On August 26, 2011, Google announced it was shutting down Slide, and that Levchin was leaving the company.
Levchin was a key early investor in Yelp, an online social networking and review service that started in 2004. He was the company's largest shareholder, owning more than 7 million shares as of 2012. Levchin served as chairman of Yelp's board of directors from its founding until July 2015.