FILE - In this Jan. 27, 2010 file photo, Reid Hoffman, Executive Chairman and Founder of LinkedIn Corporation, smiles during a social networking session at the opening day of the World Economic Forum ... more 
FILE - In this Jan. 27, 2010 file photo, Reid Hoffman, Executive Chairman and Founder of LinkedIn Corporation, smiles during a social networking session at the opening day of the World Economic Forum in Davos, Switzerland. The demand to buy a piece of LinkedIn is so intense that the 8-year-old company is expected to make its stock market debut Thursday, May 19, 2011, with a value of at least $4 billion. That would make LinkedIn's initial public offering of stock the biggest by a U.S. Internet company since Google Inc. went public in 2004, according to the research firm Renaissance Capital. less 
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Associated Press | Photo By Virginia Mayo, File
Tue, May 17, 2011 5:31 PM EDT