When the economy plummeted, Olson and Lefkow saw an increase in demand for freelancers and contractors, and launched their completely virtual staffing firm. They use group call services such a Skype and Google Hangouts to meet with their consultants. With revenue growth surging 2,696 percent in four years to $14 million in 2012, it's not surprising the company ranked 137 in 2013's Inc. 500 list of the nation's fastest-growing companies.