In Zuckerberg’s testimony before a joint session between the Senate Judiciary and Commerce committees today, the Facebook CEO was forced to confront whether his company was now effectively a monopoly. Concerns about Facebook’s monopoly status have surfaced over the last year, with growing calls to break up the company.

“Who’s your biggest competitor?” Sen. Lindsey Graham (R-SC) asked Zuckerberg. The CEO struggled to answer the question, naming Google, Apple, Amazon, and Microsoft as “overlap[ing]” with Facebook in different ways.

“If I buy a Ford, and it doesn’t work well, and I don’t like it, I can buy a Chevy. If I’m upset with Facebook, what’s the equivalent product I can go sign up for?” Graham asked. When Zuckerberg attempted to…

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