LinkedIn

LinkedIn () is an American business and employment-oriented social networking service. The platform is primarily used for professional networking and career development, as it allows jobseekers to post their CVs and employers to post their job listings. As of 2026, LinkedIn has more than 1.2 billion registered members from over 200 countries and territories. It was launched on May 5, 2003, by Reid Hoffman and Eric Ly, receiving financing from numerous venture capital firms, including Sequoia Capital, in the years following its inception. Users can invite other people to become connections on the platform, regardless of whether the invitees are already members of LinkedIn. LinkedIn can also be used to organize offline events, create and join groups, write articles, and post photos and videos.

In 2007, there were 10 million users on the platform, which urged LinkedIn to open offices around the world, including India, Australia and Ireland. In October 2010 LinkedIn was ranked No. 10 on the Silicon Valley Insider's Top 100 List of most valuable startups. From 2015, most of the company's revenue came from selling access to information about its members to recruiters and sales professionals; LinkedIn also introduced their own ad portal named LinkedIn Ads to let companies advertise in their platform. In December 2016, Microsoft purchased LinkedIn for $26.2 billion, being their largest acquisition at the time. 94% of business-to-business marketers since 2017 use LinkedIn to distribute their content.