SAN FRANCISCO (Reuters) - The firing of Citigroup stock analyst Mark Mahaney on Friday in the regulatory fallout from Facebook Inc's initial public offering was greeted with shock and dismay in Silicon Valley, where Mahaney was a well-known and well-liked figure. "Pretty shocked," was the reaction of Jacob Funds Chief Executive Ryan Jacob, who described Mahaney as one of the most respected financial analysts covering the Internet industry. "I'd put him at the top. If not at the top, then near the top," said Jacob. "He really knew what to look for. ...

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