By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) -- Tech stocks were mixed Monday, with Twitter Inc. slipping ahead of its quarterly results and GoPro Inc. losing more ground in the wake of a negative new analyst view of the digital-camera company.

Twitter (TWTR) shares were off by 34 cents at $49.64 in advance of the social-media company's third-quarter results, due after the close of trading. Analysts surveyed by FactSet are expecting Twitter to earn a penny a share, excluding one-time items, on revenue of $351 million for the quarter to end-September.

GoPro stock (GPRO) gave up more than 5%, to fall to $67.54 extending its 10% loss from Friday following a bearish note. Oppenheimer analyst Andrew Uerkwitz initiated coverage of GoPro with an underperform, or sell rating, and a $45-a-share price target. The analyst said that while GoPro has been successful so far, the company will find it challenging to expand its market beyond action sports and adventure video-capturing.

Facebook Inc. (FB) shares shed 27 cents to $80.41 ahead of the company's third-quarter results, due after Tuesday's market close.

Amazon.com Inc. (AMZN) rose $1 a share to $288.06. Before the market opened, Amazon unveiled its new Fire Stick, a TV dongle that is a condensed version of the Fire TV set-top box. The Fire Stick will cost $39 and is meant to be a competitor to similar devices from Google and Roku.

Among tech-sector leaders, Apple Inc. (AAPL), Yahoo Inc. (YHOO), Micron Technology Inc. (MU) and Google Inc. (GOOGL) were all higher.

The tech-heavy Nasdaq Composite Index (RIXF) fell almost 12 points to 4,471 and the Philadelphia Semiconductor Index (SOX) was also in the red.

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