Deceptive reviews on the Web can be very hard even for experts to identify as fake.
A team of researchers at Cornell University has been developing sophisticated automated methods to detect them, based on analysis of the text. Here are some of the features that their algorithm looks for, using this example of a fake hotel review.
Source:
http://www.nytimes.com/interactive/2011/08/20/business/20110820-is-that-review-a-fake.html
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