"It has ... substantively contributed to the level of acrimony and dissention and conflict, if you will, within the public".
Adama Dieng, who this past week visited Bangladesh's refugee camps and met officials, also urged the UN Security Council to hold Myanmar to account over the "international crimes".
Almost 700 000 Rohingya have fled Myanmar since August, crossing into Bangladesh with stories of murder, rape and arson at the hands of soldiers and Buddhist mobs in Rakhine state.
"We work with local communities and NGOs to increase awareness of our policies and reporting process, and are always looking for ways to improve people's experience on Facebook", the spokesperson said.
Investigators from the United Nations are now looking into a potential - the investigators recently said they are "becoming more convinced" that a genocide occurred - genocide in Myanmar that happened between October 2016 and August 2017. Because of that, it's been easy for ultra-nationalists to use the platform to stoke hatred against the Rohingya minority, who have been targeted by government forces, killed by the thousands and driven out of the country.
A top United Nations rights expert on Monday had warned that the crackdown on Myanmar's Rohingya minority bore "the hallmarks of genocide" and insisted the government should be held accountable.
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UN Myanmar investigator Yanghee Lee said that "everything is done through Facebook in Myanmar", adding it has been used to spread hate speech.
She further adds, "I'm afraid that Facebook has now turned into a beast, and not what it originally intended".
The U.N. human rights chief said last week he strongly suspected acts of genocide had taken place. The quest for accountability "must be aimed at the individuals who gave the orders and carried out violations against individuals and entire ethnic and religious groups", Lee said.
Myanmar's civilian leader Aung San Suu Kyi has been the target of global vitriol for a perceived failure to stand up for the stateless minority.
Lee told the Human Rights Council that violent sweeps by the Myanmar army in Rakhine state that prompted about 700,000 Rohingya Muslims to flee to neighboring Bangladesh "bear the hallmarks of genocide".
Though Facebook has yet to comment on UN's recent statement, the social media giant has previously admitted that it faces difficulty in tackling hate speech.