At the dawn of Web 2.0 a couple of years after the collapse of the Internet bubble, a new type of business emerged that enabled real people to share experiences, ratings, reviews, and recommendations for products and services with the world. In local, there was Yelp. In travel TripAdvisor. In legal, Avvo. In retail, Amazon.

At the dawn of Web 2.0 a couple of years after the collapse of the Internet bubble, a new type of business emerged that enabled real people to share experiences, ratings, reviews, and recommendations for products and services with the world. In local, there was Yelp. In travel TripAdvisor. In legal, Avvo. In retail, Amazon.