DDG has its own crawler that suppliments and cleans the main search results. http://www.gabrielweinberg.com/blog/2010/07/google-web-spam.html http://www.gabrie

DDG has its own crawler that suppliments and cleans the main search results. http://www.gabrielweinberg.com/blog/2010/07/google-web-spam.html http://www.gabrielweinberg.com/blog/2010/07/google-web-spam.... DuckDuckBot http://duckduckgo.com/duckduckbot.html http://duckduckgo.com/duckduckbot.html