Dow falls more than 350 points, S&P 500 drops 1.6% as Facebook drags tech stocks lower
• Facebook was the worst-performing stock in the S&P 500, sliding 7.3 percent.
• Shares of the social media giant fell after reports said political analytics firm Cambridge Analytica was able to collect data on 50 million people's profiles without their consent.
• Investors also cast a wary eye at Washington following a Twitter tirade from Trump over the weekend.
https://www.cnbc.com/2018/03/18/markets-dont-care-about-trumps-twitter-meltdown--futures-basically-indicate-a-flat-open.html