Many opinion aggregation websites are injected by wellformed, fake reviews. Previous work showed that such spam is very hard to identify by a non-expert human reader and therefore, automated methods are needed to identify deceptive content. To this day, there has been no study for the Polish language and our main goal is to fill that gap. We present a corpus of fake and true reviews in Polish and describe experiments on automated opinion spam detection. Our approach turns out to be highly successful, but future systematic studies are needed to confirm the nature of our findings.
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