LinkedIn is an American web based business employment oriented service. LinkedIn was founded on December 28, 2002, and launched on May 5, 2003. It is mainly used for professional networking, which includes employment posts as well as and job seeker’s professional profiles. As of 2015, most of the company's revenue came from selling profile data to recruiters and sales professionals. As of December 2016 LinkedIn has been a wholly owned subsidiary of Microsoft. As of June 2019, LinkedIn had 630 million registered members in 150 countries.