Reviews of products and services on sites such as Amazon (AMZN +0.8%), Yelp, and TripAdvisor...

|By:, SA News Editor

Reviews of products and services on sites such as Amazon (AMZN +0.8%), Yelp, and TripAdvisor (TRIP -0.5%) increasingly fall prey to fake postings and paid placements - as online marketing continues to veer off into non-traditional channels. Will the sites be able to keep up with all the spam or will they lose part of their catchet and value under the deluge?