LinkedIn has already conducted projects with six market research firms, including Phoenix Marketing International and OTX, on populations spanning business and IT decision makers, finance professionals, and government employees across four continents. The website is reportedly growing at a rate of half a million new members a week. While standard LinkedIn accounts are free, the company earns revenue through advertising, premium subscriptions, corporate solutions, job listings, and now LinkedIn Surveys. The launch of LinkedIn Surveys follows the company successfully raising $53m in funding from venture capitalists and investment bankers in June.