[webmobdev]

You have a good point. But let's not forget that the Nazi's and the Japanese used to do incredibly invasive medical tests on human beings in the name of "science". (Even the Americans have done political and medical experiments on their citizens, using the CIA, on African Americans and criminals). All these are condemned today by the scientific community because of it caused great harm (or even death) to the subjects who never gave their consent to such experiments. The psychological experiments conducted by FB on its users was equally bad because it looked to trigger emotions in the users (a useful feature for an advertising platform), some of which could cause users to go into depression. I don't know if the FB people conducting those experiments are aware that even mild depression causes great stress on an individual, and serious depression triggers suicidal impulses.

(This is not an attack on you or your otherwise valid point. Just a reminder that people should be mindful of their ethical obligations to get informed consent and not cause harm to others with their experiments).