Wall Street drops as regulation worry sinks tech shares, Nasdaq falls 1.8%

US stocks dropped on Monday, with the S&P and Nasdaq suffering their worst day in just over five weeks, as concerns over increased regulation for large tech companies was spearheaded by a plunge in Facebook shares. Facebook shares tumbled 6.

8 percent as Chief Executive Mark Zuckerberg faced calls from both US and European lawmakers to explain how a consultancy that worked on President Donald Trump's election campaign gained access to data on 50 million Facebook users. The stock had its worst day since March 2014 and was down.

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