The latest complaint, filed with federal regulators, claims that the social media giant’s ‘Tag Suggestion’ feature violates privacy rights through facial-recognition software.

The complaint, filed to the Federal Trade Commission by a coalition of US consumer rights organisations led primarily by the Electronic Privacy Information Centre, takes issue mainly with the feature which helps users identify people in photographs they have uploaded by suggesting names of people that the software recognises. The facial recognition software compares faces in photographs with an enormous amount of faces in a database.

The complaint alleges that Facebook “routinely scans photos for biometric facial matches without the consent of the image subject”, using the confirmations by users to further “advance its facial recognition techniques.”