Stay On-Topic: Generating Context-specific Fake Restaurant Reviews

05/07/2018

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by   Mika Juuti, et al.

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waseda.ac.jp

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aalto

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Association for Computing Machinery

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National Institute of Information and Communications Technology

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Automatically generated fake restaurant reviews are a threat to online review systems. Recent research has shown that users have difficulties in detecting machine-generated fake reviews hiding among real restaurant reviews. The method used in this work (char-LSTM ) has one drawback: it has difficulties staying in context, i.e. when it generates a review for specific target entity, the resulting review may contain phrases that are unrelated to the target, thus increasing its detectability. In this work, we present and evaluate a more sophisticated technique based on neural machine translation (NMT) with which we can generate reviews that stay on-topic. We test multiple variants of our technique using native English speakers on Amazon Mechanical Turk. We demonstrate that reviews generated by the best variant have almost optimal undetectability (class-averaged F-score 47 skeptical users and show that our method evades detection more frequently compared to the state-of-the-art (average evasion 3.2/4 vs 1.5/4) with statistical significance, at level α = 1 effective detection tools and reach average F-score of 97 these. Although fake reviews are very effective in fooling people, effective automatic detection is still feasible.