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Star Silicon Valley Analyst Felled by Facebook IPO Fallout

The firing of Citigroup stock analyst Mark Mahaney on Friday in the regulatory fallout fromFacebook Inc's initial public offering was greeted with shock and dismay in Silicon Valley, where Mahaney was a well-known and well-liked figure.

Facebook plumbs new lows as sales curbs start to expire

Facebook Inc shares sank 6.3 percent to a record closing low after early investors got the greenlight to sell for the first time since the No. 1 social network went public, starting a string of insider lockup expirations that will pressure the stock for months.

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