Since October 2019 the FTC has been investigating Twitter over its use of personal data for targeted ads. Twitter has set aside US$150 million for the minimum fine amount but it could possibly reach up to US$250 million.
If it’s preparing for an unfavorable outcome, that’s probably because it’s not the first tech company that’s had to face the same allegations from the FTC. Facebook previously had to pay $5 billion for several privacy missteps, including the use of people’s phone numbers, provided for security purposes, for its ad business.