Are you angry yet?

“At Cambridge,” he said, “we were able to form a model to predict the personality of every single adult in the United States of America.” … Ad targeting is personalized advertising, aligned as accurately as possible to the personality of an individual consumer.
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Cambridge Analytica buys personal data from a range of different sources, like land registries, automotive data, shopping data, bonus cards, club memberships, what magazines you read, what churches you attend.

Source: The Data That Turned the World Upside Down – Motherboard
The sole purpose of Cambridge Analytica and hundreds of other firms is mind control.
The sole purpose of Facebook is spying and dissemination of propaganda. See how our online data is combined (what I have been saying for some time) with offline data collected by others and the detailed location history provided by our pocketable tracking systems (smart phones). This level of surveillance of entire populations is unprecedented.
At this point in time, their ability to control us is over rated. Several people in the know now say that pscyhographic profiling does not work very well. But this will improve over time.
The leads to Facebook being one of the most dangerous organizations in history, with the means to have spied, in detail, on one third of the world’s population (so far) – and then provide the platform for propagandizing everyone to adopt someone’s agenda.
Zuckerberg has been and is being reckless. He has used numerous psychological tricks to get us to voluntarily give up our information (never, ever click Like – that is a trick and a trap) and then sells it or gives it away to others to be used to manipulate us. All the while, most people were unaware of how Zuckerberg and his team have been controlling us.