Here’s the best of Trump’s stock trading tweets By: MarketWatch January 28, 2017 at 06:20 AM EST Trump knocking companies on Twitter has amounted to unsteady investment guidance, writes Tim Mullaney. Read More >> Related Stocks: Facebook Fiat Chrysler Automobiles N.V. Ford Motor Goldman Sachs Group Iac Inc Macy's Mylan S&P Global Inc T-Mobile US