Tech stocks started the week off with a weak performance on Monday. Twitter Inc. shares were off by 10 cents to $49.85 ahead of the social-media company's third-quarter results, due after the close of trading. GoPro Inc. had another rough go of it, falling 3.5% to $69.59 in the wake of Oppenheimer analyst Andrew Uerkwitz starting his coverage of the digital-camera company with an underperform, or sell rating, on Friday. Small gains came from Yahoo Inc. and eBay Inc. [ebay]. The tech-heavy Nasdaq Composite Index fell 21 points to 4,461.
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