Throw this in the deep web/invisible web category:
Factual is one of a new breed of search tools that are partially solving the invisible web problem. It isn’t a replacement for Google, but rather a really interesting, useful place to turn when Google just isn’t doing it for you. And I expect as Factual grows and matures, it’s going to become ever more useful.
At Applied Semantics, Elbaz and team built the world’s largest database of words and meanings, which was subsequently folded into Google. With Factual, the goals are much bigger and more ambitious. Elbaz: “Why should I limit myself to words and meanings? Why not go for all human knowledge?”
via Factual: Parting The Curtains Of The Invisible Web.
