As much as I don't like facebook as a company, I think the jury reached the wrong decision here. If you read the complaint[1], "eavesdropped on and/or recorded their conversations by using an electronic device" basically amounted to "flo using facebook's sdk and sending custom events to it" (page 12, point 49). I agree that flo should be raked over the coals for sending this information to facebook in the first place…
I would say you have a responsibility to ensure you are getting legal data. you don't buy stolen things. That is meta has a reponsibility to ensure that they are not partnering with crooks. Flo gets the largest blame but meta needs to show they did their part to ensure this didn't happen. (I would not call terms of use enough unless they can show they make you understand it)
This happens accidentally every single day and we don't punish the victim