The decision comes days after Facebook CEO Mark Zuckerberg faced intensive questioning by U.S. lawmakers over the company's collection and use of user data.
Facebook violated an IL state law by improperly using their photo-scanning and facial recognition technologies and storing biometric data without their users' consent, a federal judge in California ruled on Monday, after reviewing a 2015 claim made against Facebook by three IL plaintiffs.
Facebook will have to face a class action lawsuit alleging it illegally violated users' privacy by using a facial recognition process on photos without explicit consent.
The study found 17% said they deleted the Facebook app from their phones, 11% said they deleted it from other devices, and another 9% said they deleted their accounts completely due to concerns regarding privacy.
Lawsuit accuses Facebook of violating a 2008 IL law that prohibits companies from collecting and storing the biometric data of people without their consent.More news: U.S. to hit Russian Federation with new sanctions for aiding Syria's Assad
The plaintiffs say Facebook's creation and storing of face templates for automatic photo-tagging purposes is prohibited under BIPA.
Facebook's arguments that no "actual" harm was caused and that the Act can't apply because its servers aren't in IL failed to convince Donato.
In a successful class action suit, any person in that group could be entitled to compensation. "We continue to believe the case has no merit and will defend ourselves vigorously", the company said in a statement, cited by Reuters. It is now unavailable in the United Kingdom, but has been a feature in the USA since 2011.
This template is then used to suggest tags for other images if it recognises the faces in them.
This is not the first time Facebook has been under fire for their facial recognition technology.