Facing claims that it violates users' privacy by storing biometric face-recognition data, Facebook called one of its software engineers to the witness stand on Wednesday in Federal Court.
In a 2015 class action, lead plaintiff Carlo Licata accused Facebook of holding the largest privately held stash of such data in the world, in violation of the Illinois Biometric Information Privacy Act of 2008.
At Wednesday's evidentiary hearing, Facebook called on software engineer Joachim De Lombaert to testify about the source code for the site's registration process, in which users agree to Facebook's terms and conditions.
Facebook argues that its biometric practices do not stray beyond those terms and conditions.
De Lombaert said that he reproduced about 150 pages of code for the registration pages that the plaintiffs would have used when they signed up for Facebook in 2005 and 2008, taking screenshots of the "accurate representations" of what the sign-up pages would have looked like at those times.
On the reproduced pages, he said, users must have clicked the box asserting that they had read and agreed to Facebook's terms and conditions in order to create their Facebook accounts.