Dozens of refugees in the UK and US have sued Facebook, accusing the social media giant of allowing hate speech against them to spread.
They are seeking more than $150 billion in damages, claiming that Facebook's platform promoted violence against them.
About 10,000 Rohingya Muslims were killed during a military offensive in Buddhist-majority Myanmar in 2017.
Facebook, now called Meta, did not immediately respond to the allegations.
The company is accused of allowing "the spread of hateful and dangerous misinformation to continue for years."
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A British law firm representing some of the refugees has written a letter to Facebook claiming that: Facebook's algorithms "amplified hate speech against the Rohingya people", the company "failed to invest" in moderators and fact-checkers who knew about the political situation in Myanmar , and the company failed to remove posts or delete accounts inciting violence against the Rohingya. It is also alleged that she failed to "take appropriate action in time despite warnings from charities in the media".
In the US, lawyers filed a legal complaint against Facebook in San Francisco accusing it of being willing to show the lives of the Rohingya people for better market penetration in the small Southeast Asian country.
They cite Facebook posts that emerged in an investigation by the Reuters news agency, including one in 2013 that said: "We must fight them as Hitler did the Jews."
Another post said: "Pour gasoline and light the fire so they meet Allah sooner."
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Facebook has more than 20 million users in Myanmar. For many, a social media site is their primary or only way to receive and share news.
Facebook admitted in 2018 that it had not done enough to prevent incitement to violence and hate speech against the Rohingya.
