The chief executive of Twitter says banning President Donald Trump from its social media platform after last week's violence in Washington sets a dangerous precedent but also says it was the "right decision".
The social media platform last week removed Mr Trump's account, which had 88 million followers, citing the risk of further violence following the storming of the US Capitol by supporters of the President.
Several other social media and messaging services have also banned the President since the violence, including Snapchat which on Wednesday permanently terminated Mr Trump's account.
The ban drew criticism from some Republicans, who said it quelled the President's right to free speech.
German Chancellor Angela Merkel also warned through a spokesman that legislators, not private companies, should decide on potential curbs to free expression.
"Having to take these actions fragments the public conversation," Twitter CEO Jack Dorsey said on Twitter.
"They divide us. They limit the potential for clarification, redemption, and learning. And sets a precedent I feel is dangerous: the power an individual or corporation has over a part of the global public conversation."
In his Twitter comments, Mr Dorsey said that while he took no pride in the ban: "Offline harm as a result of online speech is demonstrably real, and what drives our policy and enforcement above all.
"While there are clear and obvious exceptions, I feel a ban is a failure of ours ultimately to promote healthy conversation," he said.
Twitter has introduced a series of measures over the last year like labels, warnings and distribution restrictions to reduce the need for decisions about removing content entirely from the service.
Mr Dorsey has said he believes those measures can promote more fruitful, or "healthy," conversations online and lessen the impact of bad behaviour.
The Twitter CEO added that bans by social media companies on Mr Trump after last week's violence were emboldened by each other's actions even though they were not coordinated.
But in the long term, the precedent set "will be destructive to the noble purpose and ideals of the open internet," he said.
Supporters of Mr Trump, who has repeatedly made baseless claims challenging Democrat Joe Biden's victory in the November election, stormed the US Capitol last week, trying to halt the certification by Congress of Mr Biden's Electoral College win.
On Wednesday, US time, Mr Trump became the first president in US history to be impeached twice.
The developers of Snapchat say they are permanently terminating Mr Trump's account after announcing an indefinite suspension last week.
In a statement, a company spokeswoman said Snapchat had decided to permanently ban Mr Trump's account "in the interest of public safety, and based on his attempts to spread misinformation, hate speech and incite violence".
The fallout from the Capitol violence continues across other online platforms, with Airbnb saying it will block and cancel all reservations in the Washington DC, area during the week of Mr Biden's presidential inauguration.
Airbnb's decision was in response to local, state and federal authorities asking people not to travel to Washington.
The decision came two days after Airbnb said it was reviewing reservations in the area ahead of the inauguration and said it will bar any guests associated with hate groups or violent activity.
Guests whose reservations were cancelled will be refunded in full.
The company will also reimburse hosts at Airbnb's expense the money they would have earned from those cancelled reservations
"We are continuing our work to ensure hate group members are not part of the Airbnb community," the company said in a corporate blog.