Your latest hairdryer had 4,000 reviews, but you can’t find any when choosing your surgeon. How does that make sense? 

Online rating sites like Yelp, Google and Healthgrades promised to fill that gap. But what do those stars mean? Does a five-star doctor give you better care? And by the way, who’s making money every time you leave a review?

We dig into what doctors ratings can and can’t tell you, and whether you can use them to pick a doctor. Plus: Rahul looks himself up online and to his surprise finds out he speaks Vietnamese.