There's a new concept of "tweet risk" in the world now. The risk relates to Trump's itchy fingers that can affect, e.g. stock prices and, potentially, nuclear conflicts.
http://www.marketwatch.com/story/trumps-tweets-are-a-new-type-of-risk-to-wall-street-2016-12-13
http://www.marketwatch.com/story/trumps-tweets-are-a-new-type-of-risk-to-wall-street-2016-12-13