With 211 million followers on social media, the multibillionaire seems intent on using his global platform to rattle British politics.

© Pool photo by Allison Robbert

Elon Musk, the billionaire backer of Donald J. Trump, had been promoting Nigel Farage. But on Sunday Mr. Musk said Mr. Farage “doesn’t have what it takes.”

© Adam Vaughan/EPA, via Shutterstock

In a barrage of posts rife with misinformation, he revived questions about a child sex abuse scandal, vilified the prime minister and defended a jailed far-right agitator.

© Pool photo by Allison Robbert