Monday is shaping up to be a terrible day for the Nasdaq, as the Nasdaq composite slides 1.2 percent, and the more focused Nasdaq 100 index is down 1.0 percent, after bouncing back from its lows. What's notable is that a third of the decline in the Nasdaq 100 can be pegged on just three stocks that have been major tech darlings over the past year: Google, Facebook and Amazon.

"Ultimately, today, it's driven by the big names," said Rich Ilczyszyn, senior commodities broker at iiTrader. "Those big names took a shellacking on Friday, and you're seeing the carryover today."

Google dropped 2.1 percent on Monday, Facebook is down 4.2 percent and Amazon slid 2.5 percent.

Brian Stutland, of the Stutland Volatility Group, said a big article in Monday's Wall Street Journal about the problem click fraud poses for advertisers ("A 'Crisis' in Online Ads: One-Third of Traffic is Bogus") is likely weighing on Google as well as other companies in the space.

"That article has got a lot of people freaked out about these stocks," Stutland said. "Is the model still intact? Will there really be better revenue down the road?... So it's one piece of news that affects a number of names that are so much of the Nasdaq."

Colin Gillis, technology analyst with BGC Partners, said the article could certainly be contributing to the selling pressure on Google, which he covers.

"Fraud in the advertising business online is never a positive," Gillis said. "But from Netflix, to Twitter, to Yahoo, stuff is getting hammered across the board."

Indeed, with a 7 percent decline, Netflix is the Nasdaq 100's worst performer on Monday. It is followed by Alexion Pharmaceuticals (down 5.7 percent) and Keurig Green Mountain (down 5.4 percent).

Going forward, Ilczyszyn notes that the technical picture for the Nasdaq continues to be weak. The trader said that if the Nasdaq 100 closes below the 50-day moving average that it broke below on Monday, "that is a bearish circumstance, and we could go lower."

However, Stutland said to the extent that concerns about digital advertising are weighing on the market, he'd be "a buyer on the dip."

Concerns aside, the digital advertising business "is real," Stutland said. "It's not a fraud."

—By CNBC's Alex Rosenberg. Follow him on Twitter: @CNBCAlex.

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