Editor's Note: This column marks the debut of The Signal and The Noise , an attempt to direct investors to meaningful information in tech stocks amid all forms of noise -- whether it be public relations ploys, shaky accounting, bad management or silly conventional wisdom.There was a quiet but telling moment earlier this month when two of the investment banks that had led the underwriting of Baidu.com's (BIDU - Get Report) explosive IPO initiated coverage on the Chinese search company with underperform ratings.
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