WASHINGTON (News Nation) — Facebook Chief Executive Mark Zuckerberg will defend the social media powerhouse before a U.S. House of Representatives hearing Wednesday on the market power of major tech firms.

Zuckerberg’s written testimony, made public on Tuesday, argues that the social media company became successful “the American way: we started with nothing and provided better products that people find valuable.”

He added that the company competes as “vigorously as we can within the rules.” Also testifying are the CEOs of Amazon.com Inc, Alphabet Inc’s Google and Apple Inc.

The House Judiciary subcommittee on antitrust is capping its yearlong investigation of Big Tech’s market dominance with Wednesday’s teleconferenced hearing spotlighting the four CEOs: joining Zuckerberg in testifying remotely is Amazon CEO Jeff Bezos, Google’s Sundar Pichai and Tim Cook of Apple. It will be Bezos’ first-ever appearance before Congress.

Critics question whether the companies stifle competition and innovation and pose a danger to society. The Judiciary panel collected testimony from mid-level executives of the four firms, competitors and legal experts, and pored over more than a million internal documents from the companies.

You can stream the hearing live right here on NewsNationNow.com