Earlier quoted context omitted.
It's the "no one is harmed" part I strongly disagree with. Perhaps they signed up for something and have perfect knowledge of how Facebook will use the information they collect (doubtful) but the rest of us will be impacted, manipulated and harmed in some way by what Facebook ultimately ends up doing with the data that their guinea pigs willingly gave up.
> It's the "no one is harmed" part I strongly disagree with. I can't prove a negative. So you would have to prove the positive, what harm came from this app?
Would you say that the current political climate has been harmful? I would. I would not only say that, but I would also say that it's come about specifically because of data collection practices which have enabled data analysis of entire populations in a way which has never been seen before.
While analysis of populations is not inherently bad by itself, the outcome certainly has been, particularly because the abilities and effects are so new that there's little or no law governing people towards positive effects for society as a whole. Without those laws, the effects become geared toward benefiting people at the top either directly (company CEOs) or indirectly (capabilities sold to those who can afford them).