BEIJING — US President Donald Trump went around and over the “Great Firewall” of China in a late-night tweet in Beijing as he thanked his hosts for a rare tour of the Forbidden City and a private dinner at the sprawling, centuries-old palace complex.

Many Western social media platforms such as Twitter and Facebook are banned in China. A sophisticated system has been built to deny online users within China access to blocked content.

That was not an issue for Trump, known for tweeting to his 42.3 million followers at any hour of the day, on Wednesday, the day he arrived in Beijing.

“On behalf of @FLOTUS Melania and I, THANK YOU for an unforgettable afternoon and evening at the Forbidden City in Beijing, President Xi and Madame Peng Liyuan. We are looking forward to rejoining you tomorrow morning!”