@Roml0k ... Re: This is what could really do Zuckwit and his company serious harm
Grey area. Most likely nothing since they didn't 'eavesdrop' on the call and the US Supreme Court has identified the metadata as not being private.
The real issue is that they slurped data from and about people who did not agree to their T's & C's as well as one other small fact. They could have been spying on minors which brings in a whole nother slew of laws and potential lawsuits.
To your point... they could face lawsuits over the slurping because those who installed the App were not aware of the level and details that FB was slurping.
You can bet there will be some serious big dollar lawsuits against FB.