FILE-In this Friday, May 11, 2012, file photo, a worker sits in the Facebook office in Menlo Park, 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/Jeff Chiu. File)

Associated Press
FILE-In this Friday, May 11, 2012, file photo, a worker sits in the Facebook office in Menlo Park, 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/Jeff Chiu. File)
FILE-In this Friday, May 11, 2012, file photo, a worker sits in the Facebook office in Menlo Park, 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/Jeff Chiu. File)
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