Facebook Inc said on Thursday it was referring its decision to indefinitely suspend the accounts of former US President Donald Trump to its independent oversight board.
Trump will remain suspended while the board, a recently created body that can overrule the company's decisions on content, reviews the decision.
Facebook blocked Trump's access to his Facebook and Instagram accounts over concerns of further violent unrest following the January 6 storming of the US Capitol by the former president's supporters.
"I'm very confident of our case," Facebook's head of global affairs, Nick Clegg, told Reuters. "I'm very confident that any reasonable person looking at the circumstances in which we took that decision and looking at our existing policies will agree."
"But of course this is a decision which has had reverberations around the world," he added. It is the first time the company has blocked a current president, prime minister or head of state.
Facebook did not ask for an expedited review so the board, which said on Thursday it had accepted the case, will have a maximum of 90 days to make a ruling and for Facebook to act on it. An Oversight Board spokesman said it would likely be sooner than that.
The administrators of Trump's Facebook page will have the option to submit a written statement challenging Facebook's decision.
Facebook had also asked the board to provide recommendations on when political leaders can or should be blocked. Facebook does not have to act on this recommendation, unlike the board's case decision which is meant to be binding.
The oversight board, which currently has 20 members, was created by Facebook in response to criticism of its handling of problematic content.
"That's why we're here, to not leave these decisions to the leadership of Facebook but actually use the Oversight Board to look at this in a principled way," said Helle Thorning-Schmidt, a board co-chair and the former Danish prime minister.
The board, which has been criticized for its delayed start and limited remit, has not yet ruled on its first batch of cases.
Facebook said when it suspended Trump that the block would last at least until the end of Trump's presidential term and perhaps indefinitely. Trump's term expired on Wednesday when Joe Biden was sworn in as president.
Twitter Inc has suspended Trump permanently.
Trump was not made aware in advance of Facebook's decision to suspend him indefinitely, Clegg said.
"Whilst it was a controversial decision because he was the president of the United States, it actually wasn't a particularly complicated one to take," he said, adding he felt there was a "crystal-clear link" between the words of Trump and the actions of people at the Capitol.
Facebook and other social media companies have come under fire for the proliferation of violent rhetoric and election misinformation on their platforms, including by Trump and his allies. That criticism only increased around the unrest at the Capitol, which was also incited and organized on social platforms.
Asked if Facebook bears partial responsibility for the actions that led the storming of the Capitol, Clegg said: "I accept there will always be people who say we knew this was going to happen. Dare I say it, I think it's never quite as straightforward as that."
He said he did not expect other major policy changes as a consequence of recent events.
"I'm ... keen not to raise expectations that because of one event we will therefore make very significant course corrections which then have to apply, because we're a global company with global standards, to the rest of the world as well," he said.