Qwerly is an API-only business that provides an API allowing companies to mine public social web data for information about customers, users, and leads. The company's CEO, Max Niederhofer, outlines how Qwerly started in 2010 with the goal of building a universal address book of social profiles. Now, Qwerly generates all of its revenue through its API, which is used by various companies and over 2,000 API users to gather social data for their businesses.