Last week, I decided to take a gaggle of kids for an end-of-school-year lunch in a New York neighbourhood that I did not know well. I duly began looking for a suitable restaurant. A decade ago, I would have done that by turning to a restaurant guide. In the world I grew up in, it was normal to seek advice from the “experts”.

But in Manhattan last week, it did not occur to me to consult Fodor’s. Instead, I typed what I needed into my cellphone, scrolled through a long list of online restaurant recommendations, including comments from people who had eaten in them — and picked one.

Yes, it was a leap of faith; those restaurant reviews might have been fake. But there were enough voices for me to feel able to trust the wisdom of the cyber crowds — and, as it happened, our lunch choice was very good.