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Ninety percent of consumers say that they read online user reviews before they make buying decisions, and why not? What could be more helpful than the opinion of millions of Americans about the products and services they’ve tried?

But what sounds great in theory seems a lot less valuable in reality, Consumer Reports warns. That’s because the trustworthiness of user reviews is increasingly being called into question.

Good reviews can boost sales and profits; negative ones can do just the opposite.

A one-star increase in user ratings on Yelp, for example, can boost revenues by 5 to 9 percent for a restaurant, according to a 2011 Harvard Business Review study. A similar jump on Travelocity and TripAdvisor can push a hotel’s room rates up 11 percent, Cornell University researchers say.

That gives unscrupulous advertisers, businesses and reviewers all the financial motive they need to game the system. Those fabrications “are the 21st century’s version of false advertising,” says Eric Schneiderman, New York’s attorney general.

Given that reality, how can you wisely tap this often-useful information? Consumer Reports offers this advice:

• Be skeptical. You don’t know whether the strangers who write the reviews have actually used the product and are telling the truth or whether they’re shills paid $1 to $10 per review, like those uncovered in an investigation last year by Schneiderman’s office. It snared 19 companies that pumped out thousands of fake consumer reviews on such websites as Yelp, Google+ Local, Yahoo Local, CitySearch and InsiderPages.com.

• Don’t try to guess which reviews are true. Some well-intentioned consumer advice recommends that you try to be a truth detective and scrutinize reviews for signs of fakery.

But when Cornell researchers asked undergraduates to determine which of the 800 user reviews for 20 Chicago hotels were phony and which were real, the students showed no ability to do so.

One reason: People suffer from a “truth bias” that leads them to trust what they read – until they discover evidence to the contrary.

• Don’t rely on reviewer reviews. Publishers of user reviews have come up with a variety of safeguards to prevent bogus write-ups. But Consumer Reports found them to be a mixed bag.

When Nitin Jindal and Bing Liu of the University of Illinois in Chicago analyzed 5.8 million user reviews of electronics, books, music and DVDs on Amazon.com, for example, they noticed something unusual. Many of them were from “trusted reviewers” who had written hundreds or thousands of them. The researchers concluded that such an output was “unlikely for an ordinary consumer.”

• Check the criteria. Root around sites with user reviews to find out exactly how the publishers themselves manipulate, filter and use them.

OpenTable, for example, says that its reviews must “pass our standards and guidelines for publication.” The site also says that the user reviews aim to benefit diners “as well as our restaurant partners.” The partners are 31,000 restaurants around the U.S. that pay $190 million in fees for the review and booking services, and get to nominate a “featured review” for placement at the top of OpenTable’s ratings and review tab.

• Look for verified standards. To get eBay’s Top Rated Plus seal, which pushes its best merchants to the top of its rankings, sellers must maintain a good track record with known users. They also must have a significant volume of sales and adhere to pro-consumer standards, including a 14-day money-back return policy and same-day or one-business-day shipping.

• Rely most on objective evaluations. Your best sources of information are those based on scientifically sampled surveys, such as those produced by the nonprofit Consumers’ Checkbook, which rates local service companies in seven U.S. metropolitan areas; comparative product testing, such as that done by Consumer Reports; and other objective measures, as you would find with ratings from the Better Business Bureau.