LinkedIn was founded in 2002 and launched in 2003, growing to over 260 million users across 203 countries by 2013. It connects professionals through networking and allows users to list their career, skills, and education to help connect with potential employers or find potential employees. LinkedIn files users to track colleagues professionally without the personal aspects of social media sites. It earned revenue from premium subscriptions, recruiting services, and $154.6 million in advertising in 2011 alone, making acquisitions like SlideShare.