If you’re like me, then when you need some sort of service you haven’t used before you go online and look for reviews.
Many people turn to Yelp for help, which is perhaps the biggest review site in the world: it’s in 31 countries; it’s got nearly 150 million monthly unique users; and it’s got nearly 130 million reviews.
But a 2015 Harvard Business School study found that 16% of reviews on Yelp are fake. That’s about 1 in 6 reviews. However, this 16% just covers the reviews that are caught by Yelp’s algorithms and filtered out, so you don’t see them.