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WATCH: Facebook, Twitter, Google testify on Russia before House intelligence committee

Representatives from Facebook, Twitter and Google made their final appearance on Capitol Hill on Wednesday in a hearing before the House Intelligence Committee.

The tech giants continued to detail for lawmakers how Russian operatives leveraged their platforms in an attempt to influence the 2016 presidential election. Earlier Wednesday, they faced the Senate intelligence committee, and on Tuesday, fielded question from a Senate judiciary subcommittee.

Many lawmakers have expressed frustration at how the companies handled Russia-linked content on their platforms, both during the presidential campaigns and after President Donald Trump’s election. Sen. Lindsey Graham, R-S.C., called Russian interference “the national security challenge of the 21st century.”

“I must say I don’t think you get it,” California Sen. Dianne Feinstein said, during Wednesday’s Senate intelligence committee hearing. “What we’re talking about is a cataclysmic change. What we’re talking about is the start of cyberwarfare … We are not going to go away, gentlemen.”

MORE: Social media giants are vulnerable to foreign propaganda. What can they do to change?

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