Should you trust that five-star rating on Airbnb?

It’s summer in the northern hemisphere. And as holidaymakers travel to unfamiliar places, that means demand for online customer reviews. Want to find a restaurant that won’t give everyone food poisoning, or the perfect accommodation for a city break, or a mosquito repellent that actually works? Whether you are looking on Tripadvisor, Airbnb or Amazon, you will almost certainly be guided by reviews from other people. Should you be?