WhatsApp Ireland has been fined €225 million over breaches of data protection laws.
It's the largest ever fine issued by the Data Protection Commission and the second-highest under GDPR.
The watchdog's investigation began in 2018 into the sharing of data with other Facebook companies.
The Data Protection Commission has ordered the company to make a number of changes to comply with GDPR.
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WhatsApp is planning to appeal the decision.