Facebook parent Meta and Google's video platform YouTube said on Monday they were removing content supporting or praising the weekend ransacking of Brazilian government buildings by anti-democratic demonstrators.
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Tens of thousands of supporters of Brazil's far-right former President Jair Bolsonaro smashed presidential palace windows, flooded parts of Congress with a sprinkler system and ransacked rooms in the Supreme Court in a more than three hour attack.
"In advance of the election, we designated Brazil as a temporary high-risk location and have been removing content calling for people to take up arms or forcibly invade Congress, the Presidential palace and other federal buildings," a Meta spokesman said.
"We are also designating this as a violating event, which means we will remove content that supports or praises these actions," he said. "We are actively following the situation and will continue removing content that violates our policies."
Leftist President Luiz Inacio Lula da Silva took office on January 1 after defeating Bolsonaro in a runoff election in October, ending Brazil's most right-wing government in decades.
Bolsonaro refused to concede defeat and some supporters have claimed the election was stolen, with people taking to social media and messaging platforms from Twitter, Telegram and TikTok to YouTube and Facebook, to organise protests.
A spokesperson for YouTube told Reuters that the video-sharing company was "closely tracking" the situation in Brazil, where social media platforms have been ordered to block users accused of supporting the attack.
"Our Trust and Safety team is removing content that violates our Community Guidelines, including livestreams and videos inciting violence," the spokesperson said.
"In addition, our systems are prominently surfacing authoritative content on our homepage, at the top of search results, and in recommendations. We will remain vigilant as the situation continues to unfold."
‘Proactive monitoring’
A representative for Telegram said the private messaging app was working with Brazil's government and fact checking groups to prevent the spread of content inciting violence.
"Telegram is a platform that supports the right to free speech and peaceful protest. Calls to violence, however, are explicitly forbidden on our platform," a spokesperson said.
"Our moderators use a combination of proactive monitoring in public-facing parts of our platform in addition to accepting user reports, in order to remove such content."
TikTok and Twitter did not immediately respond to requests for comment.
Twitter's Brazil staff was severely cut in layoffs following Elon Musk's takeover in October, which included eight employees who oversaw trending topics and helped add context to tweets that had been labelled for misinformation, according to a source familiar with the matter.
Messages seen by Reuters throughout the week showed members of such groups organising meeting points in several cities around the country, from where chartered buses would leave for Brasilia, with the intention to occupy public buildings.
Social media companies were criticised for not doing enough when supporters of former U.S. President Donald Trump invaded the U.S. Capitol two years ago. Platforms like Facebook and Alphabet's YouTube have said they are working to remove misleading information about elections and voting.
