Right, but if that was part of a social media app (say a hypothetical "Instagram display advertising" product) then it is explicitly included in the language: "Exceptions. The prohibition in this Chapter does not apply to use of Face Recognition Technologies:... In automatic face detection services in social media applications."

While I understand the difference between detection and recognition I think an exception naming both recognition and detection is likely to be viewed by a court as permissive.

Otherwise what does that exception mean? I'm not aware of any detection functionality in any social media application that isn't tied to recognition.