By the end of its first month, LinkedIn had 4,500 members and no revenue.
Reid Hoffman co-founded LinkedIn in December 2002 with four others, including former colleagues from PayPal and Socialnet.com. The platform launched on May 5, 2003, from Hoffman's living room in Mountain View, California.1 Its premise was narrow compared to the social networks that would follow. LinkedIn existed for one purpose, to let professionals build a public profile of their work history and connect with colleagues and recruiters.
Growth was slow. By the end of its first month, LinkedIn had 4,500 members. The first million arrived in August 2004, more than a year after launch.2 The platform reached profitability in March 2006.
What LinkedIn quietly accomplished was the standardization of professional identity into a template. Every profile followed the same structure: headline, summary, work history, education, skills. The format imposed a chronological, employer-centered logic on every career, regardless of how the person actually worked. A freelancer, an artist, and a corporate executive all presented themselves through the same set of fields.
Microsoft acquired LinkedIn in December 2016 for $26.2 billion.3 Researchers at the University of Washington's Foster School of Business found in 2018 that job seekers who created LinkedIn connections with employees at target companies were actually less likely to receive referrals, because existing employees viewed them as potential competitors.4
By 2026, LinkedIn had surpassed 1.2 billion registered members in more than 200 countries.5 The resume had existed on paper for decades. LinkedIn moved it online and made it permanent, public, and searchable by every recruiter with a subscription.