During the initial days of the web, directories like Yahoo manually organized the web to find the relevant information. As web grew in size and search engine technology evolved, search engines like Google became the main source to query the web. Today, we see the next wave is making the web navigation easier by reorganizing the internet by topic or concept, and increasingly meaningful web (which may lead to Semantic Web) is being built around concepts such as Freebase, Google Squared, DBLife, and Kosmix topic pages. At Kosmix, we often ask the technical philosophy driving this change. Here is a brief overview for the geeks among us.
To start with, what do we mean by concepts? A concept is loosely defined as a set of keywords of interest, for example, the name of a restaurant, cuisine, event, name of a movie, etc. There are various websites tailored to a particular kind of concept such as Yelp for restaurants (e.g., Amarin Thai), IMDB for movies (e.g., The Shawshank Redemption), LinkedIn for professional people, Last.fm for music (e.g., U2), etc.