LinkedIn has announced that it has finally reached a major milestone: 100 million users and counting.

The company, founded in December 2002 and launched in May 2003, reached profitability fairly soon, and its growth has been accelerating over the past few years. It took LinkedIn six years to reach 50 million users, but it only took a year and a half for the business social network to double that number. LinkedIn hit 85 million members in October 2010 and revealed that it had more than 90 million users when it filed to go public earlier this year. LinkedIn is now adding one new member per second.

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