Politico reported the interview earlier on Thursday.
The FTC told Facebook in June 2019 it was probing whether the company has engaged in unlawful monopolistic practices.
Facebook faces similar probes by the Justice Department and by state attorneys general and has said the investigations are looking at prior acquisitions and business practices involving "social networking or social media services, digital advertising, and/or mobile or online applications."
Politico said Zuckerberg's testimony was conducted under oath over two days this week remotely. Staff from states investigating Facebook were also involved, Politico reported.
In July 2019, Facebook agreed to pay a record-breaking $5 billion (3.82 billion pounds) fine to resolve a separate FTC probe into the company's privacy practices.
The FTC probe that resulted in the $5 billion settlement uncovered a wide range of privacy issues.
The FTC came under criticism in the privacy probe for not requiring Zuckerberg to answer questions under oath. FTC Chairman Joe Simons said in 2019 it was unnecessary to depose Zuckerberg.
Also in July 2019, the U.S. Justice Department said it was opening a broad investigation of major digital technology firms into whether they engage in anticompetitive practices.
Last week, Deputy Attorney General Jeff Rosen told Reuters the tech investigation was going "full tilt." He declined to specify when the government would decide whether to bring an antitrust action against Alphabet Inc's Google.
(Reporting by David Shepardson; editing by Richard Pullin)
(Only the headline and picture of this report may have been reworked by the Business Standard staff; the rest of the content is auto-generated from a syndicated feed.)
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