https://www.npr.org/2018/04/19/603904858/who-is-the-mystery-man-behind-realdonaldtrump-besides-the-president

Just who controls the Twitter handle @realDonaldTrump? If you guessed the president, journalist Robert Draper says you might be only partially correct.

Draper's recent New York Times Magazine article profiles White House social media director Dan Scavino — a man Draper estimates helps craft about half of the president's tweets.

Scavino first met Trump on the golf course in 1990, when he worked as Trump's caddie. Three decades later, Draper says, a certain golf-course dynamic still exists between the president and the man who helps manage his Twitter feed.


(Emphasis added.)

HTH.

Cheers,
Scott.