Another very clever aspect is the harnessing of the 'wisdom of the crowd' -- how the actions of large numbers of people can help others make decisions -- a way of thinking that has grown up in the internet age. Examples abound, with perhaps one of the best examples being Amazon.com's 'people who bought this book also bought that one'.
No, this way of thinking didn't grow up in the Internet age. It's been around, and very successful, for thousands of years. And that Amazon example is not a good one, really. There are far better examples from the Net, but why bother with any of them when by far the best example is also the oldest and therefore the one people will be most familiar with: pricing.
Honestly, some people.