By Benjamin Pimentel, MarketWatch

SAN FRANCISCO (MarketWatch) -- Technology stocks retreated Friday as the Nasdaq Composite Index slipped below 4,000 in a broad selloff.

Yahoo (YHOO) shed 1.6% to close at $32.87, while Twitter (TWTR) gave up 3.1% to close at $40.05, setting the pace for a retreat that saw the Nasdaq (RIXF) slip 1.3% to close at 3,999.7. The benchmark ended the week down 3.1%.

The Morgan Stanley High Tech 35 Index(MSH) and the Philadelphia Semiconductor Index (SOX) were each off more than 1%.

Other major tech issues also posted losses. Apple Inc.(AAPL) was down 0.7% to close at $519.61, while Netflix Inc. (NFLX) dropped 2.4% to close at $326.71 and Amazon.com (AMZN) gave up 1.7% to close at $311.73.

Shares of Zynga Inc. (ZNGA) were up early in the session, but ended the session flat at $4.07. The social gaming company got a boost from Sterne Agee analyst Arvind Bhatia who told clients in a note, "We see potential for Zynga to report bookings at or above the upper end of management's first quarter guidance and think the stock could react positively."

He also pointed signs of "a sequential increase in overall traffic for Zynga in the first quarter of 2014 versus the fourth quarter of 2013 -- a first in seven quarters."

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Zynga names David Lee new CFO

Amazon agrees to buy digital comics firm comiXology

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