Ireland’s Data Protection Commission (DPC) has issued Twitter with a fine of €450,000 (~$547k) for failing to promptly declare and properly document a data breach under Europe’s General Data Protection Regulation (GDPR). The decision is noteworthy as it’s the first such cross-border GDPR decision by the Irish watchdog, which is the lead EU privacy supervisor for a number of tech giants — having a backlog of some 20+ ongoing cases at this point, including active probes of Facebook, WhatsApp, Google, Apple and LinkedIn, to name a few.

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