A federal judge in San Francisco has certified a class of Illinois Facebook users in a privacy lawsuit set to go to trial later this year, escalating the stakes in a lawsuit that could result in billions of dollars in damages against the social media giant.

U.S. District Judge James Donato of the Northern District of California on Monday certified a class in a case brought against Facebook under the Illinois Biometric Information Privacy Act, or BIPA—a law governing the collection and storage of biometric indicators like fingerprints, facial features and iris scans.