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arXiv · 2605.17655

Disarranged Harmonization of Transparency Reporting by Social Media Platforms Under the Digital Services Act

Amaury Trujillo·Benedetta Tessa·Stefano Cresci
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Abstract

The European Commission recently introduced new regulation to harmonize transparency reporting of large online platforms under the Digital Services Act (DSA). Here, we present the first systematic evaluation of transparency reporting data quality after this normative change, for the eight largest social media platforms in the European Union. In detail, we run a set of large-scale quantitative analyses on key reporting dimensions, followed by a structured comparative assessment across platforms and reporting mechanisms. Among our findings is that: (i) the analyzed platforms had varying degrees of compliance and data quality, but all exhibited issues on data formatting, timeliness, consistency, and completeness; (ii) some platforms employed differing reporting procedures across mechanisms, which caused them to submit contrasting information; (iii) despite the harmonization, a number of issues still prevent interoperability between reporting mechanisms; and (iv) many of the previously identified issues with transparency reporting are still unresolved. We conclude by discussing implications for transparency auditing and proposing key targeted improvements to strengthen the reliability and interoperability of DSA transparency reporting.

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Amaury Trujillo, Benedetta Tessa, Stefano Cresci. 2026-05-17. Disarranged Harmonization of Transparency Reporting by Social Media Platforms Under the Digital Services Act. https://arxiv.org/abs/2605.17655

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