Silicon Valley stocks: Synaptics shares soar on analyst upgrade as Facebook falls
(World News USA)

Social media giant Facebook (NASDAQ: FB) rattled Wall Street late Thursday with its announcement that it would make big changes to News Feed that could impact engagement time on the site, at least in the short term. Shares fell 4.47 percent, making it the worst performing Silicon Valley stock for the day. Meanwhile, Apple supplier Synaptics (NASDAQ: SYNA) led Silicon Valley stocks with a 13.35 percent upswing following an analyst upgrade. The San Jose-based company makes fingerprint sensors and... ......