By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) -- Tech stocks were set to end the week on a negative note Friday, as big losses from social-gaming company Zynga Inc. and online-travel site Expedia Inc. took center stage.

Zynga (ZNGA) shares tumbled almost 18% to $2.88 after the company reported a decline in its second-quarter sales and forecast weaker-than-expected results for its third quarter.

New Chief Executive Don Mattrick, who was hired away from Microsoft Corp. (MSFT) just three weeks ago, said Zynga was backing away from plans to push into "real money gaming" in the U.S. and would focus on free, social games. Mattrick added that he anticipates "two to four quarters of volatility" as Zynga sorts out its various issues and strategies.

Expedia (EXPE) was having an even worse day than Zynga, with its stock price plunging more than 26% to $47.97.

Late Thursday, Expedia reported second-quarter results that missed analysts' expectations, as earnings fell from the same period a year ago. Expedia said its results were hampered by a 33% rise in its sales and marketing costs, as well as strong competition by rivals.

Led by Expedia, other online travel sites also retreated, with Orbitz Worldwide Inc. (OWW) down by 4% and Priceline.com Inc. (PCLN) shares falling by 2% to $891.89.

Other notable decliners included Netgear Inc. (NTGR), which fell more than 9%, to $29.99 after the networking-equipment company on Thursday gave a third-quarter outlook that missed analysts' forecasts. Analysts at RBC Capital Markets cut Netgear's rating to underperform, or sell, from sector perform.

Outerwall Inc. (OUTR), which recently changed its named from Coinstar, fell by almost 13%, to $56.93 after the operator of Redbox DVD rental kiosks gave a second-quarter report that missed Wall Street's estimates and cut its outlook for its entire fiscal year.

Losses also came from tech bellwethers Hewlett-Packard Co. (HPQ), Netflix Inc. (NFLX), IBM Corp. (IBM), Netflix Inc. (NFLX), Yahoo Inc. (YHOO) and Google Inc. (GOOG).

The few gainers included videogame publisher Activision Blizzard Inc. (ATVI), which rose more than 13%, to $17.26. There were reports that Activision is going to buy out Vivendi's controlling stake in the company.

Amazon.com Inc. (AMZN) shares rose 10 cents to $303.49 after reporting mixed quarterly results late Thursday.

The Nasdaq Composite Index (RIXF) fell 15 points to 3,590, and the Philadelphia Semiconductor Index (SOX) gave up 1.2%.

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