Silicon Valley Companies

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FILE-In this Monday, May 9, 2011, photo, LinkedIn Corp., the professional networking Web site, displays its logo outside of headquarters in Mountain View, Calif. Silicon Valley, it turns out, doesn't revolve around the stock prices of Facebook and its playful sidekick, Zynga. Instead, the optimism in Silicon Valley can be seen in a variety of ways in this area that covers roughly 40 miles from San Jose to San Francisco.  (AP Photo/Paul Sakuma)