Detecting Crowdsourced Spam Reviews in Social Media

User submitted reviews are used by potential buyers to evaluate products before their purchase. In this work we study cases of deceptive reviews on Amazon.com which rate the products favorably. These were paid for through a number of crowd- sourcing websites. The behavior of the review spammers as a group has distinguish- able characteristics which are used in our proposed method. We use a probabilistic model for spammer pairwise collaboration which is used to cluster reviewers. The introduced model is verified on a set of synthetic data and outperforms a baseline classifier which treats reviews on their own, without their social context. The performance of the proposed method for detecting clusters of spammers is also compared to an alternative approach. Finally we demonstrate some of the detected clusters of review spammers on the data set which was crawled from Amazon.