Elon Musk's X, formerly known as Twitter, has taken a High Court challenge against media regulator Coimisiún na Meán, questioning the lawfulness of investigations and the handling of information arising from user complaints.
At the High Court, X's lawyers applied for a stay relating to the commission's October 2025 decision to pass information relating to complaints to its internal "supervisory" team for possible future investigation.
The court heard that when the commission has concluded an investigation, it can pass information to the "Platform Supervisory Team" to consider possible systemic issues.
X submits that the commission could not legally refer information garnered from complaints to the supervisory team if those complaints are already concluded, undetermined or if information contained within can be used for broader, future investigations.
Neil Steen SC, for X, submitted that when one investigation concludes, the commission cannot pass the information to another branch for further investigation.
He further argued that both X and any complainant were entitled to be informed in advance of any proposed actions.
Mr Steen said the commission was attempting to deploy a "semantic trick", by concluding a "specific" complaint investigation while retaining information to look into any "systemic" issues in the future.
It is submitted in court papers by X that the commission had "no provision which allows a delegate to delegate their delegated powers to another delegate [the Platform Supervision Team]" for future use.
Mr Steen said X regularly takes "unilateral" removal action on material posted on its site through "proactive steps on many, many" cases, such as "child exploitation", which it is obligated to do by its own regulatory policies.
Counsel said the commission must carry out the terms of what it is investigating in writing and that all parties must be informed in advance of any outcome of what is proposed to be done by the commission.
Mr Steen said the concern of X was whether an investigation into a complaint or any appeal can still be internally investigated by the commission's supervisory team without it being formally communicated to the parties involved.
Mr Steen said the passing of specific complaint information to the supervisory team could lead to a "residual possibility" of future investigations, though the specific matter had concluded.
Mr Steen said that complainants and X in any matter were both "entitled" to an outcome instead of the commission "kicking the can down the road without notification" on any possible purported breaches.
Counsel said that if the stay on investigation was not granted by the court, the commission's parameters of investigation would be "entirely unclear".
He said it was a matter for the court to decide the question of "a risk of injustice or harm" in the matter.
Counsel said X was a "significant operation" that wanted to comply with regulations but the commission had employed a referral to its supervisory team that was, under law, "new territory for everyone concerned".
Counsel said that if a stay was granted it would "simply prevent the commission from polluting its own" in carrying out its work without clarity from the court.
David Fennelly SC, for the commission, said that X was attempting to undermine the watchdog's important role in prima facie cases that had implications across the EU.
He said the information regarding complaints had already been transferred to the supervisory team so that they could investigate how specific cases fed into a "broader picture" regarding investigating online complaint systems.
Mr Justice Cian Ferriter said he would deliver his decision on the stay application next week.
