Facebook whistleblower Frances Haugen testified before Congress on Tuesday, telling a Senate subcommittee that the social media giant is putting profits before people.

Haugens claims are supported by tens of thousands of pages of internal Facebook research, which she previously provided to The Wall Street Journal .

The paper used the documents to publish a series of highly damaging articles about Facebook, alleging that, among other things, the company knew Instagram was toxic for teenagers even as it pursued strategies to sign up younger and younger children.

In her opening statement, Haugen urged Congress to regulate Facebook. She compared the company to Big Tobacco, which for decades hid research about its products true harm.

The documents I have provided to Congress prove that Facebook has repeatedly misled the public about what its own research reveals about the safety of children, the efficacy of its artificial intelligence systems, and its role in spreading divisive and extreme messages, Haugen said. I came forward because I believe that every human being deserves the dignity of the truth.