File photo: AP

Bangkok - Facebook users in coup-rattled Thailand reacted with alarm on Wednesday when they were suddenly unable to access the popular social networking site, but the junta quickly denied imposing a block.

“Urgent: Facebook has been suspended,” one user wrote on Twitter.

“Surely that would be suicide. Whole country would protest,” wrote another user.

But just minutes later users celebrated: “Facebook is back!!”

The military regime which seized power on May 22 said it had not pulled the plug on the site.

“We have not ordered a block of Facebook - it's not our policy,” said army spokesman Colonel Winthai Suvaree.

“Facebook experienced a slight technical failure and the Ministry of Information and Communication Technology (ICT) is working to fix it now,” he said.

In the sign of the power of social media in the digital era, the junta even interrupted normal television broadcasts to reassure the nation that Facebook was not under siege.

Surachai Srisaracam, permanent secretary at the ICT ministry, said reports quoting him as confirming a Facebook block were “all a misunderstanding”.

“The gateway had a problem,” he told AFP. “I think it works now.”

But some users were unconvinced, speculating that it could have been a trial run for a possible blackout in the future, or a warning shot to social media users not to criticise the coup.

Social media platforms such as Twitter and Facebook are hugely popular in the country, and have been used by anti-coup protesters to organise small protests against the junta.

The military has warned it would block any platforms found to carry content that incites violence, or is critical of its military leaders or the monarchy.

So far about 330 websites have been taken offline by the junta, according to technology crime suppression officials.

Foreign television news channels such as the BBC and CNN have also been blocked.

Even before the declaration of martial law last week, Thailand faced criticism about its curbs on the media, particularly harsh royal defamation legislation which critics say is used to muzzle political dissent.

In 2010 more than 1 300 websites - including Wikileaks - were blocked during a protest by “Red Shirts” supporters of former premier Thaksin Shinawatra, whose ousting in a coup eight years ago ignited the protracted political crisis.

Websites like Facebook and Twitter have played a key role in galvanising popular uprisings in the Arab world since 2010 that have resulted in the toppling of longtime autocratic leaders in Tunisia, Libya, Egypt and Yemen. - AFP