“For four years you’ve rationalized this terror. Inciting violent treason is not a free speech exercise,” Chris Sacca, a tech investor who had invested in Twitter, wrote to Mr. Dorsey and Facebook’s chief executive, Mark Zuckerberg. “If you work at those companies, it’s on you too. Shut it down.”
Twitter, Facebook and others had previously resisted cracking down on Mr. Trump’s posts and other toxic content, saying that the posts were in the public’s interest. While the platforms had started taking more steps against political misinformation in the months before the election, they declined to remove Mr. Trump’s messages and instead took half measures, such as labeling his posts.
So when violence broke out in Washington on Wednesday, it was, in the minds of longtime critics, the day the chickens came home to roost for the social media companies. After the onslaught of criticism began, Twitter and Facebook started removing several of Mr. Trump’s posts from their sites, including one where the president falsely said that “a sacred landslide election victory” had been “unceremoniously & viciously stripped away.”
“We know the social media companies have been lackadaisical at best” at stopping extremism from growing on their platforms, said Jonathan Greenblatt, director of the Anti-Defamation League. “Freedom of expression is not the freedom to incite violence. That is not protected speech.”
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Renee DiResta, a researcher at the Stanford Internet Observatory who studies online movements, added that the violence was the result of people operating in closed social media networks where they believed the claims of voter fraud and of the election being stolen from Mr. Trump.
“This is a demonstration of the very real-world impact of echo chambers,” she said. “This has been a striking repudiation of the idea that there is an online and an offline world, and that what is said online is in some way kept online. I hope that this eliminates the conception from people’s minds.”
YouTube also said on Wednesday that it would not tolerate calls for violence on their sites. The video site said it removed multiple live streams that showed participants storming the Capitol building carrying firearms. It also said it would elevate authoritative news sources on its home page, search results and in recommendations.