By Benjamin Pimentel, MarketWatch

SAN FRANCISCO (MarketWatch) -- Shares of Symantec Corp. fell Tuesday on news that a top executive is leaving, but the tech sector got a lift from rallying shares of Facebook Inc., Yelp Inc. and Advanced Micro Devices.

Symantec (SYMC) shed 0.7% to close at $23.05 a day after announcing that Francis deSouza, the firm's president of products and services, is departing on Dec. 1. DeSouza will become president of Illumina, which develops systems for analysis of genetic variation and biological function.

J.P. Morgan analyst John DiFucci told clients in a note, "We view Mr. deSouza as a strong technology leader who will be missed at Symantec and this may result in pressure on the shares."

Facebook (FB) edged up about 1% closing at $46.60. On the other hand, Twitter Inc. (TWTR) shed 2.3% to close at $41.90.

Twitter, which went public last week, got a neutral rating from Baird Equity Research and Susquehanna Financial Group.

"While we like Twitter's opportunity to benefit from (and drive) the surge in social and mobile advertising, and our analyses of four strategies to improve monetization underscore the optionality for much higher earnings power, we are wary of current valuation levels and await a better entry point to turn positive," Brian Nowak of Susquehanna told clients in a note.

AMD (AMD) gained 3% to close at $3.44. The chip maker on Tuesday said it has closed a deal for a $500 million secured revolving line of credit.

Shares of Yelp Inc. (YELP) rose 3.8% to close at $65.13. Jefferies analyst Brian Fitzgerald raised his price target on the company's stock to $80 a share from $50.

In a research note, Fitzgerald said that the online review and recommendation company's "depth and penetration of content is very hard to replicate and is the company's core competitive advantage against other players trying to enter the market."

The Nasdaq Composite Index (RIXF) eked out a fractional gain, closing at 3,920. The Morgan Stanley High Tech 35 Index (MSH) and the Philadelphia Semiconductor Index(SOX) were each up a fraction.

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