His team managed to wrest it away from him for the last few days of the campaign, but he's back in action now!
It doesn't make a blind bit of difference to his fan base (which, don't forget, is a good 47m Americans) because he has always been quite transparently awful on Twitter.
It's a bit cringey for the US publicly, because when he is president, a lot more people outside the country will hear about it, and see that the country is being "run" by a dotty, inarticulate, petulant and spoilt old man.