Facebook whistleblower Frances Haugen returns to Capitol Hill Wednesday to testify before the House Energy and Commerce Committee on proposals to revamp online platforms' liability immunity.

Why it matters: Haugen, a former Facebook engineer, has shared troves of internal research documents that lawmakers believe could open a path for legislation overhauling Section 230 of the Communications Decency Act, tech's liability shield.

• Haugen will testify before the Commerce Committee's communications and technology subpanel, detailing why she thinks Congress needs to act to hold Big Tech accountable, according to her opening remarks.

The big picture: Meta, formerly known as Facebook, has endured months of public scrutiny about its internal research and impacts on users, including on younger children. That's thanks to Haugen's leaks, testimony and tons of press coverage of the Facebook Papers.

Context: In earlier testimony to the Senate Commerce Committee, Haugen expressed support for changes to Section 230, which lets platforms moderate user-contributed content without opening themselves to lawsuits. She said she supports modifying Section 230 by "exempting decisions about algorithms."

• "Facebook wants you to get caught up in a long, drawn-out debate over the minutiae of different legislative approaches," Haugen said in her prepared remarks. "Please don’t fall into that trap. Time is of the essence. There is a lot at stake here. You have a once-in-a-generation opportunity to...

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