If something illegal has happened then Facebook or Cambridge Analytics deserve to be held accountable however if data has been harvested in line with agreed Terms and Conditions and now people are violated and offended as they don't like why the data was used then fúck them.
Remarkable stupidity of the people to think they were handing over all this data to a global giant who ask for no financial donation, and to then think said data was not being used for x, y and z.