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The issue here is not some developer gaining a temporary snapshot of a few million records, it is that Facebook _itself_ is doing and productizing real-time psychological profiling on billions of people.

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This was revealed years ago. Facebook was literally running experiments on people on the site, without their consent, to see how they reacted when their feed was made either more negative or more positive. Most people seemed to not care when this was revealed which is, in my opinion, just an indication of the level of addiction people have to the service.

You can find a plenty of hits searching for 'facebook run psychological experiment on users.' Here [1] is one of a plethora of sources discussing it.

[1] - https://www.telegraph.co.uk/technology/facebook/10932534/Fac...

> which is, in my opinion, just an indication of the level of addiction people have to the service

I don't think that's it. I think the problem is that what was revealed was far too abstract for most people to fundamentally grasp.

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