San Francisco: Facebook on Wednesday said it has nixed 5.4 billion fake accounts already this year, in a sign of a persistent battle on social media against manipulation and disinformation.

"We have improved our ability to detect and block attempts to create fake, abusive accounts," the internet firm said in its latest transparency report.

"We can estimate that every day, we prevent millions of attempts to create fake accounts using these detection systems." Facebook believes that fake accounts -- where someone pretends to be a person or entity which does not exist -- represented about five percent of its worldwide month active users during the second and third quarters of this year.

The social network has invested heavily in finding and taking down accounts crafted to deceive people about where information is originating, particular when spread as part of coordinated campaigns with political or social agendas.

The detailed report also showed that government demands for user information hit a new high led by the US. Overall request by governments for Facebook user data rose 16 percent to 128,617 in the first half of this year.

"Of the total volume, the US continues to submit the largest number of requests, followed by India, the UK, Germany and France," the report stated.

Facebook received 50,741 requests from the US for information regarding 82,461 accounts, with roughly two-thirds of those done in a way prohibiting the social network from letting users know about inquiries, the report showed.

"We always scrutinize every government request we receive for account data to make sure it is legally valid," Facebook deputy general counsel Chris Sonderby said in an online post about the latest figures.

"This is true no matter which government makes the request." In a detailed transparency report that, for the first time, included photo and video-oriented social network Instagram, Facebook also highlighted progress tackling terror, hate, suicide, child porn, and drug related posts.

"While we are pleased with this progress, these technologies are not perfect and we know that mistakes can still happen," Facebook said.

"That's why we continue to invest in systems that enable us to improve our accuracy in removing content that violates our policies while safeguarding content that discusses or condemns hate speech."

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Panaji (PTI): As part of a crackdown against tourist establishments violating laws and safety norms in the aftermath of the Arpora fire tragedy, Goa authorities on Saturday sealed a renowned club at Vagator and revoked the fire department NOC of another club.

Cafe CO2 Goa, located on a cliff overlooking the Arabian Sea at Vagator beach in North Goa, was sealed. The move came two days after Goya Club, also in Vagator, was shut down for alleged violations of rules.

Elsewhere, campaigning for local body polls, AAP leader Arvind Kejriwal said the fire incident at Birch by Romeo Lane nightclub at Arpora, which claimed 25 lives on December 6, happened because the BJP government in the state was corrupt.

An inspection of Cafe CO2 Goa by a state government-appointed team revealed that the establishment, with a seating capacity of 250, did not possess a no-objection certificate (NOC) of the Fire and Emergency Services Department. The club, which sits atop Ozrant Cliff, also did not have structural stability, the team found.

The Fire and Emergency Services on Saturday also revoked the NOC issued to Diaz Pool Club and Bar at Anjuna as the fire extinguishers installed in the establishment were found to be inadequate, said divisional fire officer Shripad Gawas.

A notice was issued to Nitin Wadhwa, the partner of the club, he said in the order.

Campaigning at Chimbel village near Panaji in support of his party's Zilla Panchayat election candidate, Aam Aadmi Party leader Kejriwal said the nightclub fire at Arpora happened because of the "corruption of the Pramod Sawant-led state government."

"Why this fire incident happened? I read in the newspapers that the nightclub had no occupancy certificate, no building licence, no excise licence, no construction licence or trade licence. The entire club was illegal but still it was going on," he said.

"How could it go on? Couldn't Pramod Sawant or anyone else see it? I was told that hafta (bribe) was being paid," the former Delhi chief minister said.

A person can not work without bribing officials in the coastal state, Kejriwal said, alleging that officers, MLAs and even ministers are accepting bribes.