In a lengthy philosophical tweetstorm,Twitter chief executive Jack Dorsey said he took no pride in the decision to remove President Donald Trump's account from the service last week.
Facebook's Mark Zuckerberg and Twitter's Jack Dorsey admitted the companies have made some mistakes,but mostly defended their policies.
The tweet from US President Donald Trump threatened"serious force"against protesters in the US capital.
Prominent Republicans and usually supportive media outlets have criticised Trump for spreading unfounded conspiracy theories about the death of a Florida woman.
Jack Dorsey is devoting $1.6 billion to help fund the coronavirus relief effort,the biggest single donation by the world's richest so far.
Twitter reaches an agreement with Elliott Management that lets Jack Dorsey stay as chief executive,while adding three new directors.
A prominent activist investor has amassed a stake in Twitter and is pushing for changes,including removal of the social media company's chief executive,Jack Dorsey,two people familiar with the matter say.
A Twitter spokesperson said in an emailed statement that the accounts were hacked through a third-party platform.
"Twitter just walked away from hundreds of millions of dollars of potential revenue,"Trump's campaign manager says,calling the decision another attempt to silence conservatives.
Twitter chief Jack Dorsey announced the news,saying social media companies give advertisers an unfair advantage in proliferating highly targeted,misleading messages.