Facebook on Wednesday denied the false crisis notification - the so-called Safety Check - for a Bangkok explosion the previous day was made in error.
The company cited Thai media reports of a man threatening to attack Government House with explosives early Tuesday for triggering the Satefy Check, where users mark themselves as "safe" to reassure friends and family.
"There was no false alarm. The event happened and Safety Check worked as it should," a Facebook representative told dpa.
The representative confirmed to dpa the crisis notification was active from 1 pm (0600 GMT) Tuesday for nine hours, but users only reported receiving the notification from approximately 9 pm onward before it was turned off about an hour later.
Facebook denied reports in the Thai media that the Safety Check was triggered due to a BBC article posted last year on a Bangkok bombing that was picked up by MSN news bot.
The BBC article was published on August 17, 2015, and reported on a real bombing that killed 20 people at the Erawan Shrine in Bangkok.
On Tuesday, a 44-year-old contractor climbed on top of the main building of Government House and threatened to activate ping pong bombs if the government refused to give him financial compensation for a failed construction project.
The man managed to throw firecrackers off the roof, but they did not cause any injuries. After several hours of negotiation, officials convinced the man to climb down from the roof.
The Paris terrorist attacks of November 2015 were the first time Facebook's Safety Check was activated for an event other than a natural disaster.