One of the most popular applications Flo, used daily by millions of women worldwide to track their menstrual cycles, has become the center of a high-profile lawsuit. Users accuse the company of sharing their personal data, including sensitive health information, with third parties – such as Meta, Google, to advertising analytics platforms – without their consent. The case was heard by a federal court in California, and it ended with a verdict against Meta.

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LIGA.net rephrases the gist of the matter:

  • The trial began on July 21 in federal court in San Francisco. The lawsuit was filed in 2021. Users allege that Flo Health Inc. shared confidential data with third parties, including Meta (Facebook), Google, AppsFlyer, and Flurry, without their consent.
  • Google has already agreed to the terms of a settlement, Flurry settled the case in March, and the lawsuit against AppsFlyer was withdrawn back in 2022.
  • Flo and Meta, who are suspected of using data for advertising purposes, remain to be heard in court.
  • The plaintiffs' lawyers are demanding that Flo be recognized as a medical application and accuse the company of violating California's laws on the confidentiality of medical information.
  • Flo denies all accusations, claiming that it did not transfer health data, did not sell it, and that users themselves agreed to the processing of information.
  • On August 1, 2025, a California federal jury found Meta guilty of illegally collecting sensitive information from users of the Flo app. The company violated the California Invasion of Privacy Act. Meta stated it would appeal the decision.

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women's healthprivacyMetaFlo