LinkedIn priced its initial public offering at $45 a share on Wednesday, the upper end of its estimate -- but it now seems the company might have lowballed itself. Investors piled onto the stock as markets opened, sending prices to $90 soon after the opening bell today and catapulting LinkedIn's total value to a hefty $8.5 billion. That raises questions about the accuracy of the private markets used to calculate the value of non-public companies such as Facebook and Twitter, which had previously pegged LinkedIn's value at a relatively paltry $2.5 billion, writes Shira Ovide.

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