LinkedIn Joins the Billionaires' Club

New funding by Bain, Bessemer, Sequoia, and Greylock values the professional-networking site north of $1 billionand big plans are afoot

LinkedIn is joining the Web 2.0 high rollers' club. The professional networking site, home to some 23 million affluent users who sign up to find jobs, hire talent, and connect on projects, is about to become one of the select few social-media companies to attain a valuation of more than $1 billion.

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