The content reviewers are a mix of full-time employees, contractors and companies Facebook partners with -- covering every time zone and over 50 languages across the world.
"Content review at this size has never been done before. After all, there has never been a platform where so many people communicate in so many different languages across so many different countries and cultures. We recognise the enormity of this challenge and the responsibility we have to get it right," Ellen Silver, Vice President of Operations at Facebook, wrote in a blog post on Friday.
"Language proficiency is key and it lets us review content around the clock. If something is reported in a language that we don't support 24/7, we can work with translation companies and other experts who can help us understand local context and language to assist in reviewing it," Silver added.
The company came under heavy criticism Channel 4 Dispatches -- a documentary series -- sent an undercover reporter to work as a content moderator in a Dublin-based Facebook contractor.
It showed that moderators at Facebook were preventing Pages from far-right activists from being deleted even after they violate the rules.
In a blog post, Monika Bickert, Vice President of Global Policy Management at Facebook, said the TV report on Channel 4 in the UK raised important questions about their policies and processes.
Facebook has also promised to double the number of people working on its safety and security teams this year to 20,000.
Silver said the company is training its team of content reviewers in three areas -- pre-training which includes what to expect on the job; hands-on learning that includes a minimum of 80 hours with a live instructor followed by hands-on practice and ongoing coaching.
"We want to keep personal perspectives and biases out of the equation entirely -- so, in theory, two people reviewing the same posts would always make the same decision. Of course, judgments can vary if policies aren't sufficiently prescriptive.
Facebook said it audits a sample of reviewer decisions each week to find out if a wrong call was made.
"Our auditors are even audited on a regular basis. In addition, we have leadership at each office to provide guidance, as well as weekly check-ins with policy experts to answer any questions," said the social media giant.
Facebook said it has a team of four clinical psychologists across three regions who are tasked with designing, delivering and evaluating resiliency programmes for everyone who works with graphic and objectionable content.
"This group also works with our vendor partners and their dedicated resiliency teams to help build industry standards," said Silver.
Besides the Chief Minister, special POCSO (Protection of Children from Sexual Offences) court judge Manoj Kumar on Friday ordered the Central Bureau of Investigation to probe the role of Muzaffarpur District Magistrate Dharmendra Singh and Principal Secretary, Social Welfare Atul Prasad.
The court's order came as it heard a petition filed by accused Ashwani, a self-claimed medical practitioner, demanding an investigation into the role of the three.
According to a charge sheet filed in the case, Ashwani used to visit the shelter home to allegedly administer sedative-laced injections to the inmates before they were subjected to sexual abuse.
The Muzaffarpur horror came to light in May 2018 when the Bihar Social Welfare Department filed an FIR based on a social audit of the shelter home conducted by the Tata Institute of Social Sciences, Mumbai.
Brajesh Thakur, a journalist-turned-social activist heading the NGO which ran the shelter home, and other accused were arrested. The matter was handed over to the CBI in July last year.
State Social Welfare Minister Manju Verma was forced to resign after the opposition protests over reports that her husband and former Janata Dal-United legislator Chandreshwar Verma allegedly had close links with Thakur.
Thakur has been shifted to a jail in high-security Patiala following a Supreme Court order while other accused, including his close aides and some government officials, are lodged in jails at Patna and Muzaffarpur.
The trial of the case was this month shifted to Delhi.
The apex court had recently also directed the CBI to take over the probe into allegations of sexual abuse at all such shelter homes across the state.
Rashtriya Janata Dal spokesperson Bhai Virender demanded resignation of Nitish Kumar following the court order. "Nitish Kumar was involved in the case and was protecting the accused and trying to suppress the facts since the beginning," he said.