The US Federal Trade Commission is probing Twitter Inc for alleged violations of a law that prevents the social network from using personal data provided for security purposes to target ads, the company disclosed on Monday.

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In a regulatory filing, Twitter said it received a draft FTC complaint alleging violations between 2013 and 2019.

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Twitter said it estimates probable loss of between US$150 million and US$250 million in settlement charges, and has already recorded US$150 million of that estimate in accrual related to the allegations.