LONDON, July 5 -- The night before SpaceX began trading on the Nasdaq and Elon Musk became the world's first trillionaire, Musk was reposting video of Rupert Lowe, the leader of the British far-right Restore Britain party, calling for the United Kingdom to deport migrants who cannot financially support themselves.

That was not unusual for those two weeks. In the period from May 31 to June 12, The Guardian analyzed Musk's activity on X, the social media platform he owns, in the run-up to SpaceX's initial public offering. He posted 303 times about race and immigration. He posted 114 times about SpaceX. Roughly 75 percent of those immigration posts were directed specifically at UK politics. The world's most influential private citizen, on t...