Following a nearly two-year investigation and decision-making process, the Irish Data Protection Commission (DPC) on Tuesday fined Twitter €450,000 (U.S. $547,000) for breaching Europe’s strict privacy rules for failing to report a data breach within the required 72 hours and document it properly.

Neil Hodge is a freelance business journalist and photographer based in Nottingham, United Kingdom. He writes on insurance and risk management, corporate governance, internal audit, compliance, and legal...