On Wednesday, the general counsels of Facebook, Twitter, and Google returned to Capitol Hill for two more hearings before the Senate and the House Intelligence Committees.
During the morning session, Sen. Dianne Feinstein had some harsh words for the tech representatives.
"You created these platforms ... and now they're being misused," she said. "And you have to be the ones who do something about it — or we will."
Many political observers, including members of Congress, also expressed disappointment that the companies' top leaders declined to publicly answer questions about the serious charge that a foreign actor used their networks to meddle in the US election.
Sens. Martin Heinrich of New Mexico and Angus King of Maine were among those who reprimanded the companies' CEOs for not showing up.
"I'm disappointed you're here and not your CEOs," King told the companies' lawyers.