Media regulator Coimisiún na Meán has found that Facebook is "exposed to terrorist content".
An Coimisiún has issued the decision following the notification of removal orders to the platform from EU authorities.
Facebook's parent company Meta must take specific measures to prevent the service from being used for the dissemination of terrorist content and to report on the measures it has taken.
Under EU law, terrorist content includes material that incites the commission of terrorist offences, as well as content that provides instruction on the making or use of explosives, firearms, or other weapons.
Under the Terrorist Content Online Regulation, hosting service providers which receive two or more final removal orders from EU authorities within the last 12 months may be determined as being exposed to terrorist content.
Among the measures a hosting service provider exposed to terrorist content is required to take is the inclusion in its terms and conditions of provisions to address the misuse of its service for the dissemination to the public of terrorist content.
"Infringement by hosting service providers of the Terrorist Content Online Regulation can lead to the imposition of administrative fines, including financial penalties of up to 4% of global turnover," Coimisiún na Meán said.
In November, An Coimisiún determined that TikTok, X and Instagram services were "exposed to terrorist content" under the Terrorist Content Online Regulation.
