This year’s Hay festival concluded with a strange spectacle. I was on a panel about the dangers of excessive tech power, alongside former Meta employee Sarah Wynn-Williams – who sat without saying anything on the advice of her lawyer. She had been silenced by Meta’s legal threats to bankrupt her if she spoke.

Wynn-Williams has written a book, Careless People, about her time at Meta (then Facebook), where she was an early director of global public policy. In the tradition of such books (usually written by former government officials), it is in parts flattering, more often critical and, above all, insightful.

But Meta does not like the book. It has done everything in its power to stop it, including seeking an emergency arbitration order that prevents Wynn-Williams from promoting the book, and threatening punitive damages. These serve both to punish Wynn-Williams for writing it, and to send a warning to any future critic.

Were this a book about time spent in government, it is clear that free speech principles would protect the author’s right to speak (at least about unclassified matters). But because her book is critical of a private company – and because, as an employee, she signed standard agreements banning “disparaging, critical........

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