Global stocks tank most since Nov; Facebook data breach drags tech stocks

US stocks joined a broad decline in global equity markets on Monday as traders turned cautious ahead of the Federal Reserve's policy meeting this week and amid continuing concerns about the threat of a global trade war.

The Dow Jones Industrial Average fell as much as 425 during the session and ended won 335.60 points, or 1.35 per cent, at 24,610.91. The S&P 500 index lost 39.09 points, or 1.42 per cent, to 2,712.92 and the tech-heavy Nasdaq Composite index dropped 155.07 points, or 1.8 per cent, to 7,334.24.
MSCI's main 47-country world stock index fell 1.1 per cent in afternoon trading after European stocks dipped and benchmark US indexes declined. Global equities are on their worst run since November.
Facebook shock to tech stocks

At the same time, shares of Facebook Inc shed nearly 7 per cent after reports that a political consultancy that worked on US President Donald Trump's 2016 campaign gained inappropriate access to data on 50 million of the social network's users. That decline dragged other technology stocks, which have led the market higher over the last two years.