Wall Street drops to its worst day since June after the sell-off for tech stocks deepens

Wall Streets tech sell-off deepened on Friday as investors questioned whether massive spending on artificial intelligence will deliver enough returns to justify lofty valuations. The S&P 500 fell 1.8% and the Nasdaq 2.9%, with Intel plunging nearly 29% and Nvidia down 4.2%, while bitcoin also slid after a major hack at Binance.