AI can spot fake online reviews

Scientists have developed an artificial intelligence (AI) system that can identify machine-generated fake reviews on online e-commerce websites.

Sites like TripAdvisor, Yelp and Amazon display user reviews of products and services. Nine out of ten people read these peer reviews and trust what they see, researchers said.

However, not all reviews are legitimate. Fake reviews written by real people are already common on review sites, but the amount of fakes generated by machines is likely to increase substantially.

According to doctoral student Mika Juuti at Aalto University in the US, fake reviews based on algorithms are nowadays easy, accurate and fast to generate.

Most of the time, people are unable to tell the difference between genuine and machine-generated fake reviews.

"Misbehaving companies can either try to boost their sales by creating a positive brand image artificially or by generating fake negative reviews about a competitor," said Juuti.

"The motivation is, of course, money: online reviews are a big business for travel destinations, hotels, service providers and consumer products," he said.

In 2017, researchers from the University of Chicago in the US described a method for training a machine learning model, a deep neural network, using a dataset of three million real restaurant ratings on Yelp.

After the training, the model generated fake restaurant reviews character by character.

There was a slight hiccup in the method, however; it had a hard time staying on topic. For a review of a Japanese restaurant in Las Vegas, the model could make references to an Italian restaurant in Baltimore. These kinds of errors are easily spotted by readers.

To help the review generator stay on the mark, Juuti and his team used a technique called neural machine translation to give the model a sense of context.

Using a text sequence of 'review rating, restaurant name, city, state, and food tags', they started to obtain believable results.

"In the user study we conducted, we showed participants real reviews written by humans and fake machine-generated reviews and asked them to identify the fakes," said Juuti.

"Up to 60 per cent of the fake reviews were mistakenly thought to be real," he said.

Researchers then devised a classifier that would be able to spot the fakes. The classifier turned out to perform well, particularly in cases where human evaluators had the most difficulties in telling whether a review is real or not.