With Sri Lanka under a state of emergency after a spasm of anti-Muslim bloodshed, lawyer Jeevanee Kariyawasam went on Facebook to complain. The company hadn’t blocked users inciting violence, she wrote, and the government hadn’t arrested those sending out the offending posts.

Facebook’s response was swift: it suspended Kariyawasam’s account.

The company restored her account within 24 hours but the incident this month highlighted how Facebook has become a powerful vehicle for hate speech worldwide, and how the Silicon Valley giant’s efforts to police incendiary rhetoric in distant countries have often fallen short.

When a Sri Lankan Facebook user complained in March of a post that said, Kill all Muslims, don’t let even one child of the dogs escape,” it took the company six days to respond. Then it said the post did not meet its definition of hate speech.

In Myanmar, United Nations investigators said in March that Facebook had turned into a beast” by propelling racism and calls to violence against Rohingya Muslims. In Cambodia and the Philippines, authoritarian leaders have used Facebook to disseminate propaganda and whip up animosity toward journalists and political opponents.

In Sri Lanka the government accused Facebook of failing to take down posts and videos that encouraged the violence in Kandy in early March.

As extremists from the island nation’s Buddhist majority torched Muslim-owned houses and businesses, authorities directed internet providers to block Facebook and its two popular apps, WhatsApp and Instagram, along with other social media platforms.

The ban was lifted a week later, after officials from Facebook’s regional office in India flew down to meet with government representatives in Colombo, Sri Lanka’s capital. Over a two-hour meeting at the seafront presidential offices, company officials pledged to act more swiftly to remove hate speech in Sri Lanka’s native languages.

We wanted them to be concerned about the fact that if you go on like this, you will create bloodshed unnecessarily,” said Austin Fernando, a senior aide to Sri Lanka’s president.

Facebook has been shaken by the criticism across Asia, the company’s fastest-growing regional market with half a billion daily users, nearly three times the number in the United States. In emerging economies where internet access is expanding and space for public expression is often limited, Facebook’s popularity has grown faster than its ability to monitor what its users are saying.

The best way to curb social media hate speech – don’t fuel the fire

Company officials say they have invested heavily in technology to more quickly identify and remove content that violates its community standards” barring racist and discriminatory posts. Over the last year, Facebook says, it has also doubled its number of content monitors, with about 14,000 people now checking posts and reviewing complaints in more than 40 languages. But that is less than half of the more than 100 languages Facebook supports.

In Sri Lanka – with an estimated 6 million users – Facebook said it increased its capacity to monitor posts in Sinhala, the language spoken by the Buddhist majority, and ran notices atop users’ news feeds about how to report hate speech.

It took down some accounts, including one belonging to Amith Weerasinghe, a Buddhist radical with more than 150,000 followers, who was seen on a video prodding Sinhalese to attack Muslims in Kandy.

Weerasinghe and several suspected associates were arrested, among dozens jailed in connection with the violence.

We have clear rules against such content and will remove it when we’re made aware of it,” Facebook said in a statement. We have been working with the government and non-government organisations in Sri Lanka to identify and remove hate speech.”

Still, the company has privately acknowledged mistakes. During the violence in Kandy, which left three people dead and caused millions of dollars in damage, Kariyawasam emerged as one of the most prolific online activists reporting accounts with names such as Sinhala Racist”, which claimed that Sri Lanka was the exclusive domain of the Sinhalese race”. But Facebook chose to not block that and many other accounts, she said, while hers was peppered with death threats.

It makes you think that Facebook is either under capacity to monitor what’s happening in Sinhala, or that some of their Sinhala-speaking monitors share the same biases as the people that are being reported,” said Yudhanjaya Wijeratne, an author and internet researcher in Colombo.

For decades, Sri Lanka has been riven by violence between Sinhalese Buddhists, who make up about 70 per cent of the country’s 21 million people, and minorities including Muslims and Tamil-speaking Hindus. Since a long civil war against Tamil rebels ended a decade ago, Buddhist extremists have periodically led attacks against Muslims, who account for about 10 per cent of the population.

Under then-president Mahinda Rajapaksa’s authoritarian, Buddhist nationalist government, hardline monks enjoyed virtual impunity, stoking fears of terrorism and forced conversions to Islam. The Muslim Council of Sri Lanka has documented several hundred incidents of violence and intimidation, nearly all at the hands of Buddhist groups.

In 2014, the independent Centre for Policy Alternatives produced a study of anti-Muslim hate speech on 20 Sri Lankan Facebook groups. Co-author Sanjana Hattotuwa said the posts, which clearly violated Facebook standards, remained online for months because the company had zero capacity to monitor Sinhala”.

In Myanmar, Facebook has acknowledged the long-term challenge” of determining when certain words – such as kalar, a slur for Rohingya Muslims that the company said had benign roots – are being used to encourage violence. The posts that Hattotuwa studied were so vile, he recalled, that he advised his co-author to seek counselling.

It didn’t require a nuanced understanding of language,” Hattotuwa said, adding, It was blatant. If you translate it directly into German or French, it would still be obnoxious.”

In January 2015 elections, minority voters, including Muslims, helped unseat Rajapaksa. But his successor, Maithripala Sirisena, has sought to accommodate Buddhist hardliners.

Days after the violence in Kandy, Sirisena made an official visit to Japan, where he addressed a group of saffron-robed monks. Among them was Galagodatte Gnanasara, founder of an extremist group called Bodu Bala Sena, or Buddhist Power Force, who has been charged with inciting pogroms in 2014 that left four people dead.

The group has used Facebook to spread false information about Muslims – including that one Muslim-owned shop was selling candy that would turn Buddhist women infertile.

Sirisena’s office denied that Gnanasara – who is free on bail and reportedly visited Kandy the day the attacks broke out – was part of the government delegation. But officials acknowledged that a top aide to the notorious monk had travelled with the president.