Work has been done on this. Apparently you can detect fake reviews to some degree using text features alone: http://www.cs.uic.edu/~liub/FBS/fake-reviews.html

Work has been done on this. Apparently you can detect fake reviews to some degree using text features alone: http://www.cs.uic.edu/~liub/FBS/fake-reviews.html http://www.cs.uic.edu/~liub/FBS/fake-reviews.html