Mark Zuckerberg doesn’t understand what privacy means—he can’t be trusted to define it for the rest of us.

In a letter published when his company went public in 2012, Mark Zuckerberg championed Facebook’s mission of making the world “more open and connected.” Businesses would become more authentic, human relationships stronger, and government more accountable. “A more open world is a better world,” he wrote.

Facebook’s CEO now claims to have had a major change of heart.

In “A Privacy-Focused Vision for Social Networking,” a 3,200-word essay that Zuckerberg posted to Facebook on March 6, he says he wants to “build a simpler platform that’s focused on privacy first.” In apparent surprise, he writes: “People increasingly also want to connect privately in the digital equivalent of the living room.”

Zuckerberg’s essay is a power grab disguised as an act of contrition. Read it carefully, and it’s impossible to escape the conclusion that if privacy is to be protected in any meaningful way, Facebook must be broken up.

Facebook grew so big, so quickly that it defies categorization. It is a newspaper. It is a post office and a telephone exchange. It is a forum for political debate, and it is a sports broadcaster. It’s a birthday-reminder service and a collective photo album. It is all of these things—and many others—combined, and so it is none of them.

Zuckerberg describes Facebook as a town square. It isn’t. Facebook is a company that brought in more than $55 billion in advertising revenue last year, with a 45% profit margin. This makes it one of the most profitable business ventures in human history. It must be understood as such.

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