Facebook has agreed to stop using WhatsApp data to target users with advertising in the U.K. and has been warned could face legal action if it resumes the practice.

The agreement is an initial victory for Information Commissioner Elizabeth Denham, who launched an inquiry into the data sharing earlier this year after expressing concern that user data was not being properly protected.

“I don’t think users have been given enough information about what Facebook plans to do with their information, and I don’t think WhatsApp has got valid consent from users to share the information,” she said in a statement on Monday.

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