Apart from the privacy implications and questionable ethics of social-media experimentation on users who had no idea they were part of a study, Facebook also altered its data use policy in May 2012, four months after the study was conducted. The policy change specifically said that user data might be used for research and could be shared with researchers, a major point of contention in the EPIC complaint.
Regulators in the U.K. and Ireland are also investigating the study.
Facebook issued a statement via email when asked for comment about EPIC's complaint with the FTC, saying that the company isn't commenting about the complaint specifically.
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