The tech company has lost a massive privacy case involving the Flo app that has raised huge questions about how health apps are secretly being used.

Meta lost a major privacy trial on Friday, with a jury in San Francisco ruling that the Menlo Park giant had eavesdropped on the users of the popular period-tracking app Flo. The plaintiff's lawyers who sued Meta are calling this a "landmark" victory - the tech company contends that the jury got it all wrong.

While Flo promised to keep users’ sensitive reproductive health information private, the lawsuit alleged that Flo allowed Google and Meta to eavesdrop on in-app communications between November 2016 and February 2019,