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In August 1972, a collective of writers, mostly in Melbourne, released the first issue of a biweekly broadsheet that would chronicle a certain corner of Australian countercultural life — starting with a scathing piece on the “young press baron” Rupert Murdoch.

Former Prime Minister Boris Johnson said the tycoon “did more than any press baron in the last 100 years to promote the cause of the global free media that is indispensable for democracy and progress.”

In a string of posts on Friday, Mr. Musk — who, like any proud press baron, keeps a close watch on his platform — cracked jokes, defended his positions, and needled his critics.

But as people debated complex, novel issues of free speech and online censorship, the move also underscored the role of a simpler, more enduring element of American life: the press baron.

Maxwell, the daughter of late British press baron Robert Maxwell, is serving her sentence in a Tallahassee, Florida, prison, and is appealing her conviction.