The posts on Taiwanese gadget forums included spurious complaints about HTC's flagship One phone and benchmarks favorably comparing Samsung handsets to those from HTC.
The FTC ruled the fabricated posts could have deceived consumers and affected their buying habits, while rival companies would have no way of knowing the forum posts were marketing activities rather than legitimate posts.
Samsung responded by saying it was "disappointed" in the commission's decision.
"Samsung Electronics Taiwan is carefully reviewing the decision and will take all necessary steps to protect our reputation as a company which values its customers," the company said in an email, without disclosing whether it would pay the fine.
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