Re: Definition of theft / fraud
Fraud. If the data didnt have value, Facebook wouldn't want it. And there was deception involved as people thought they were authenticating themselves, not providing Facebook with their intellectual property. Hell, a ex-Intel engineer is being sued by Intel for among other things taking employee contact information with him when he left for Micron:
https://www.theregister.co.uk/2018/11/29/intel_3d_xpoint_complaint/