Social media giant Facebook, now known as Meta Platforms, faces a US$3.2 billion plus class action in Britain over allegations it abused its market dominance by exploiting the personal data of 44 million users.

Liza Lovdahl Gormsen, a senior adviser to Britain's Financial Conduct Authority (FCA) watchdog and a competition law academic, said she was bringing the case on behalf of people in Britain who had used Facebook between 2015 and 2019.

The lawsuit, which will be heard by London's Competition Appeal Tribunal, alleges Facebook made billions of dollars by...