Associated Press
In this Tuesday, May 7, 2013, photo, LinkedIn CEO Jeff Weiner stands at the entrance to his company's Mountain View, Calif., headquarters. LinkedIn and Facebook celebrate the anniversaries of their IPOs just a few days apart this week. But the companies' experiences as publicly traded entities couldn't be more different. LinkedIn promotes its service as a stepping stone to a more enriching career. As it turns out, the professional networking company's IPO was a great place to start a rewarding investment portfolio, too. LinkedIn's stock has nearly quadrupled in value from its $45 IPO price two years ago. (AP Photo/Noah Berger)

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