http://www.tusavvy.com/

About Us : zSoup, Inc.

Tusavvy, a service of zSoup delivers a new social search engine to find community knowledge without navigating the entire web

With a year long development, a new engine – Tusavvy – was built by using socially annotated web data. It provides concise results using a lexicon built by tags, and rankings selected by social factors like the user’s accumulated interests