Facebook And The Ethics Of User Manipulation (2014)
A recent study conscripted Facebook users as unwitting participants during a weeklong experiment in direct emotional manipulation. The study set out to discover if the emotional tone of a users’ News Feed content had an impact on their own emotional makeup, measured through the tone of what they posted to the social service after viewing the skewed material.
Nearly 700,000 Facebook users were shown either more positive, or more negative content. The study found that users who were given more positive news feeds posted more positive things, and users who were given more negative news feeds posted more negative things.
Surprising? Doubtful. Unethical? Yes.
https://techcrunch.com/2014/06/29/facebook-and-the-ethics-of-user-manipulation/
First they "sell" > Then they manipulate > Then they CONTROL
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http://www.wired.co.uk/article/chinese-government-social-credit-score-privacy-invasion