Google rejected requests to send its CEO Sundar Pichai or parent firm Alphabet chief Larry Page, but offered a writted statement from its chief legal officer Kent Walker.
Dorsey argues the law allows the internet economy to flourish: "If we didn't have that protection, we would not be able to do anything around harassment or to improve the safety or health of the conversation around the platform".
Twitter's Dorsey, who has come under fire in recent weeks for remaining more "hands-off," said the social network was unprepared for what the election brought to its platform. But we are even more determined - and we will continue to fight back. "We were slow to act, the tweet was up for 5 hours but it was way too long", he said.
"That's on us", she wrote.
Also on Wednesday, Facebook founder Mark Zuckerberg in an op-ed piece in the Washington Post, wrote: "It's an arms race, and it will take the combined forces of the United States private and public sectors to protect America's democracy from outside interference". "That's why it is incredibly important for the public to understand how precisely the companies' machine-learning algorithms shape what we see online and who we engage with online".
Piper Perabo Arrested While Protesting At Brett Kavanaugh SCOTUS Confirmation Hearing
Democrats will try to corner Kavanaugh on how he would rule on cases involving abortion access and the Affordable Care Act. The court begins its next term in October. "I do not decide cases based on personal or policy preferences".
Rep. Leonard Lance speaks out on what he plans to ask Twitter CEO Jack Dorsey on the handling of conservative content.
Sandberg could also face questions related to concerns over Facebook users' privacy.
The companies have made many policy changes, and have caught and banned malicious accounts over the past year.
Richard Burr, R-N.C., the chairman of the committee, said in his opening remarks.
A committee spokesperson said Walker's "commentary" was not testimony, adding, "We wish his enthusiasm for participating in the company's public hearing extended to his company's senior leadership, and that they were willing to answer the committee's questions".
China hosts African leaders amid aid criticism
Xi said the financing would be in the form of government help as well as investment and funding by institutions and companies. The money would be focused on infrastructure to help speed African countries' development, not on "vanity projects", Xi said.
A spokesperson for Twitter declined to comment, but in past hearings Twitter officials have affirmed the gravity of the situation.
Facebook and Twitter executives pledged on Wednesday to better protect their social media platforms in the 2018 elections and beyond, and told Congress of aggressive efforts to root out foreign intrusions aimed at sowing divisions in American democracy.
Facebook is going after "inauthenticity", or fake accounts.
By Adam Satariano, Daisuke Wakabayashi and Cecilia Kang President Donald Trump, in a series of early morning Twitter posts Tuesday, attacked Google for what he claimed was an effort to suppress conservative news outlets supportive of his administration.
"Period", Dorsey told the House Energy and Commerce Committee.
Nike's new ad featuring Colin Kaepernick released
A roadie and "ex-Marine" chopped the Nike swoosh off his socks and posted a picture that went. you guessed it, viral. WATCH: Nike calls Kaepernick inspirational, but as Eric Sorensen reports, it's ignited a firestorm.