By Rex Crum, MarketWatch

SAN FRANCISCO (MarketWatch) -- The tech sector tried to eke its way into positive territory Friday, but big losses from social-gaming company Zynga Inc. and online-travel site Expedia Inc. continued to drag on investors' minds in afternoon trading.

Zynga (ZNGA) shares tumbled almost 16% to $2.96 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.

Read: Zynga's crisis to test CEO Mattrick's mettle.

Expedia (EXPE) was having an even worse day than Zynga, with its stock price plunging more than 25% to $48.51 a share.

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 almost 3% and Priceline.com Inc. (PCLN) shares giving up 1.3%, to trade at almost $900 a share.

Other notable decliners included Netgear Inc. (NTGR), which fell more than 9%, to $29.95 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 more than 12%, to $57.29 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) had a good day, rising 3%, to a new all-time high of $313.62 a day after reporting mixed quarterly results late Thursday.

Apple Inc. (AAPL), Oracle Corp. (ORCL), Facebook Inc. (FB) and eBay Inc. (EBAY) also advanced.

The Nasdaq Composite Index (RIXF) nearly erased all of it losses, but was still down by 1 point at 3,604, and the Philadelphia Semiconductor Index (SOX) gave up more than 1%.

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