Which popular company was criticized after agreeing to conduct an experiment on its users without the users' knowledge or consent?

Name: Which popular company was criticized after agreeing to conduct an experiment on its users without the users' knowledge or consent?
Brand: Quizplus
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Question

Quizplus · Accepted Answer

Facebook faced significant criticism for conducting an experiment on its users without their knowledge or consent, manipulating the emotional content of their News Feeds to study the effects on their emotions.

Which Popular Company Was Criticized After Agreeing to Conduct an Experiment