Meta Platforms Ireland Ltd v Data Protection Commissioner (Approved)

Factual and Procedural Background

This ruling concerns an application by the Appellant in one of several statutory appeals it has brought against the Respondent. The specific appeal in which this motion was brought is identified in the record as the "Passwords Appeal" and challenges a decision of the Respondent made on 26 September 2024 (the "Passwords Decision") under section 111 of the Data Protection Act 2018 and Article 60 GDPR. The Passwords Decision arose from an own-volition inquiry commenced on 24 April 2019 and concluded that the Appellant had infringed Articles 33(1) and 33(5) GDPR and failed to comply with Articles 5(1)(f) and 32(1) GDPR, resulting in a reprimand and aggregate administrative fines of €91 million.

The Appellant sought, by motion, an order under Order 25(1) (alternatively Order 34(2)) of the Rules of the Superior Courts directing a trial of four specified preliminary issues. Critically, the Appellant sought a direction that those preliminary issues be listed for hearing at the same time as, or immediately after, preliminary issues already fixed for hearing on 2 December 2025 in separate proceedings brought by Company A (the "Company A Appeal"), in which the same four legal questions had been fixed for preliminary hearing.

Motion papers and affidavits were exchanged between the parties (Affidavit of Attorney Varian; replying affidavit of Attorney Young; further replying affidavit of Attorney Varian). The Respondent opposed the motion. The Attorney General participated on the basis that the preliminary issues in Company A's proceedings related to connected judicial review proceedings.

Legal Issues Presented

1. Whether the Appellant is entitled to appeal the entire Decision under section 142 of the Data Protection Act 2018 or whether some aspects can proceed only under section 150 of that Act.
2. What type of appeal section 142 provides for and what standard of review or assessment the Court should apply in an appeal under section 142, having regard to the Respondent's role under the GDPR and that the Decision was adopted under Article 60 GDPR.
3. If aspects of the Appellant's appeal can only proceed under section 150, whether a different standard of review applies in an appeal under section 150 and, if so, what that standard is, again having regard to the Respondent's role and the GDPR context.
4. Whether, and to what extent, the Appellant may rely on evidence and arguments in the appeal which were not adduced or made to the Respondent during the inquiry process.

Arguments of the Parties

Appellant's Arguments

• The Appellant argued that the interpretation of sections 142 and 150 advanced by the Respondent is incorrect, and must be construed compatibly with constitutional and fundamental rights instruments (Articles 34 and 37 of the Constitution, Article 6 ECHR, and Articles 41, 47 and 48 of the EU Charter).
• The Appellant submitted that the four preliminary issues are suitable for preliminary determination and that the Court would benefit from hearing a second, different factual permutation (a "pathfinder" or additional example) — namely the factual matrix in the Passwords Appeal — when deciding the legal questions.
• The Appellant emphasised it intends to adduce expert evidence (Expert Peters) addressing technical matters (e.g., "state of the art" for encryption measures) which it said would assist the Court in contextualising and deciding the preliminary issues, including question 4 concerning the admissibility of new evidence on appeal.
• Reliance was placed on authorities (including an example where two pathfinder cases were used) to support the proposition that more than one factual permutation can be helpful when deciding net legal questions.
• The Appellant accepted it might add a limited additional hearing time (two days) and argued that duplication could be managed by case management and sequencing to avoid wasteful repetition.

Respondent's Arguments

• The Respondent contended the Appellant has no right to be heard on the preliminary issues fixed in Company A's proceedings; permitting the motion would be inefficient, duplicative, and burdensome for the Court and the Respondent.
• It was argued that the preliminary issues are net legal questions, not fact-dependent, and that introducing a second hearing on identical legal issues would add cost and complexity without assisting the Court.
• The Respondent disputed that Expert Peters' report (or other facts from the Passwords Appeal) adds material assistance for the preliminary issues and argued that emphasising factual material risks undermining the character of the questions as preliminary issues.
• Reference was made to the need to conserve costs and court time and to established case-management principles that avoid unnecessary duplication.
• The Respondent also alleged delay on the part of the Appellant in bringing its motion after developments in Company A's proceedings had already advanced to a state of readiness.

Attorney General's Arguments

• The Attorney General described the application as unorthodox and cautioned against allowing business interests alone to justify participation in another party's preliminary hearing.
• It was emphasised that the default is a single, unitary trial and that permitting the Appellant's proposal would disrupt established case-management norms unless compelling reasons and "sample quality" were shown to justify a second pathfinder approach.
• The Attorney General warned that the logistical management of duplication across multiple appeals would be difficult and likely to prolong resolution without demonstrable benefit to the Court.

Table of Precedents Cited

This table catalogs the authorities expressly cited in the opinion and the uses made of them in the ruling.

Precedent	Rule or Principle Cited For	Application by the Court
Appellant A v. Board A [2025] IECA 202 (identified in the opinion as "Xerico")	Cited as an example where two pathfinder cases were used when appeal provisions were similar and preliminary issues were tried with more than one factual example.	The Court acknowledged the case but concluded it provided limited guidance here because the selection of pathfinder cases and factual distinctions in that decision were not explained in detail; it did not justify a second hearing in the present circumstances.
Company A v. Company B [2010] 2 IR 581 (identified in the opinion as "Kalix")	Cited for principles of case management, the court's inherent jurisdiction to manage proceedings where factual and legal overlap exists, and the importance of avoiding unnecessary duplication to conserve court resources.	The Court relied on these principles as central to its analysis and emphasized that efficiency, conservation of costs and time, and avoidance of duplication weigh against granting the Appellant's motion.
Appellant B v. Tribunal A [2006] IEHC 388 (identified in the opinion as "Nyembo")	Cited by the Respondent as a relevant authority discussing factors to weigh in the context of trials of preliminary issues and case management.	The Court noted the case among authorities identifying relevant case-management factors but did not rely on it as determinative; it forms part of the cited jurisprudential context supporting denial of duplicative hearings.
Appellant C v. The State [2015] 2 IR 45 (identified in the opinion as "L.M.")	Cited to caution that courts may refuse to determine a preliminary issue if it becomes apparent the issue is heavily fact-dependent or would amount to an advisory opinion.	The Court used this authority to reinforce that preliminary issues must be capable of being determined without heavy factual inquiry and that nothing before the Court showed the present questions were too fact-dependent for determination in Company A's proceedings.
Company C v. Company D [2021] IEHC 163 (identified in the opinion as "Avoncore")	Cited in support of case-management options, sequencing and the idea that duplication can in some contexts be mitigated by directions and coordination between cases sharing legal teams.	The Court considered Avoncore but found it distinguishable because that case involved common legal teams and management practices not present here; Avoncore did not justify ordering a second hearing with different legal teams.
Appellant D v. Local Authority A [2015] 1 IR 716 (identified in the opinion as "Campion")	Cited for the proposition that Order 25(1) and Order 34(2) exist to save time and cost and that convenience is a relevant consideration when deciding whether to direct preliminary hearings.	The Court relied on the general principle that these procedural rules are aimed at saving time and cost and concluded the Appellant had not shown that those aims required a second hearing of identical legal issues.
Appellant E v. Company E [1994] 3 I.R. 63 (identified in the opinion as "Duffy v. News Group Newspapers (No.2)")	Appeared as supporting authority within the quoted passage regarding the purpose of preliminary process rules to save time and costs.	Included by the Court in the stream of authority supporting the procedural objectives of Orders 25 and 34; not relied upon for a novel principle beyond that context.
Appellant F v. Company F (Unreported, High Court) (identified in the opinion as "Croke v. Waterford Crystal")	Referenced in the same passage emphasising the purpose of preliminary processes to save time/costs.	Noted as part of the authorities reiterating the procedural aims that weigh against duplication of hearings.
Appellant G v. Minister for Health [2024] IEHC 712 (identified in the opinion as "Lynch")	Cited for an overview of the pathfinder/test-case model: its case-management purpose, selection of lead cases, and the possibility that more than one lead case may be needed to represent factual permutations.	The Court used Lynch to describe the pathfinder model and concluded the present situation did not fit that model because there was no proposal to stay other appeals or a demonstrated selection of lead cases representing the pool of factual permutations.

Court's Reasoning and Analysis

Judge Cahill began from the well-established premise that the Court has broad case-management discretion, which must be exercised so as to ensure just and efficient use of parties' and judicial resources. Orders 25(1) and 34(2) are to be read in light of those considerations (cost, time and convenience).

The Court identified what the motion was not: it was not seeking consolidation, joinder, a stay, or designation of Company A's proceedings as a pathfinder that would govern other proceedings. Instead, the Appellant sought a separate listing of the identical four preliminary legal issues for hearing at the same time as (or immediately after) Company A's already-fixed preliminary hearing.

(a) Test for Preliminary Issues: The Court emphasised that the four issues in Company A's proceedings had been fixed as preliminary issues to be decided as net legal questions divorced from contested facts. Given the purpose and scope of preliminary-issues procedures, it would require something exceptional to justify allowing a second hearing of the same net legal questions in another appeal. The Appellant had not shown that the factual matrix in its Passwords Appeal was necessary for fair determination of those legal issues. Regarding the proposed expert material, the Court observed there was no clear basis to conclude that Company A's proceedings lacked a suitable evidential foundation for the preliminary hearing, and the Appellant could not show the expert evidence would materially alter the legal questions.

(b) Pathfinder/Test-Case Analysis: The Court reviewed the pathfinder/test-case model and authorities describing it. While acknowledging that pathfinder approaches have been used where many overlapping cases exist and where one (or more) lead cases are advanced to guide the remainder, the Court concluded that Company A had not been designated as a pathfinder and the present application did not present the structural features of pathfinder litigation (no proposal to stay other appeals; no shared legal teams; no examined selection of representative factual permutations). The Court further noted that the precedent relied upon by the Appellant (where two pathfinder cases arose) did not provide detailed guidance supporting a second hearing here.

(c) Case-Management Considerations: The Court accepted that, in some contexts, duplication could be minimised by sequencing and active case management (as in Avoncore), but found those features absent here. With multiple different legal teams and the Appellant's explicit desire to present different versions of legal argument, the Court concluded that the likely outcome would be multiple overlapping sets of submissions on the same legal questions, imposing a significant additional burden on the Court and other parties and risking erosion of the net-legal-question character of the hearing.

(d) Delay: The Court noted a period of inactivity in the Appellant's procedural chronology and that, by the time the Appellant issued its motion, Company A's preliminary hearing had already been case-managed and prepared. While delay alone did not bar the motion, it undercut the Appellant's contention of prejudice and reinforced the position that the status quo (Company A's hearing) provided a ready and suitable forum for determination of the preliminary issues.

Overall, the Court determined that the Appellant had not shown exceptional circumstances to justify a second hearing of identical preliminary legal issues and that the considerations of efficiency, conservation of judicial resources and avoidance of duplication weighed decisively against the application.

Holding and Implications

Holding: The application for the orders sought was denied. The Court concluded that it was not appropriate to direct a trial of the same preliminary issues in the Appellant's proceedings at the same time as or immediately after the preliminary-issue hearing already fixed in Company A's proceedings, and accordingly the reliefs sought in the Motion are REFUSED.

Implications:

• The immediate practical effect is that the four identified preliminary issues will proceed in Company A's proceedings as already fixed for hearing on 2 December 2025, and those determinations will provide binding legal guidance (precedential effect) for other statutory appeals where appropriate.
• The Appellant was not granted the procedural opportunity to have the identical preliminary issues separately listed for hearing in its Passwords Appeal at the same time or directly following Company A's hearing.
• The Court emphasised that this decision was founded on case-management principles (efficiency, avoidance of duplication, conservation of costs and court time) applied to the facts and procedural posture before it; the ruling did not purport to establish any novel legal principle beyond the ordinary exercise of the Court's case-management discretion.