You know President Trump has hit on something effective when the media are constantly telling him to stop it, and nothing has exemplified this more than his use of Twitter. Ever since the campaign, the punditry and the political class has insisted that someone needs to take his phone away from him or else there will be disaster. Maybe there are some on his staff who agree, but no one appears to have the chops to actually do it, and the president keeps on tweeting.
Now I hate Twitter. The culture of Twitter is a microscopic step up from Hell itself. But Trump has correctly understood from the start of his campaign on through the first year of his presidency that the use of Twitter gives him a platform other presidents either didn't have or didn't have the courage to use to its full effect. It's more than just going around the media and talking directly to the American people, although it's certainly that an importantly so. It's also a way of manipulating the media he's going around. They don't cover everything Trump tweets, but when he decides to get really provocative, they're all over it. Of course, they think they're damaging Trump by covering his edgier tweets, but every time they do they're allowing Trump to set the terms of the day's discourse.