Linked by Thom Holwerda on Wed 9th Feb 2011 23:29 UTC
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Member since:
2007-03-26
They have their own crawler.
From what I understand, the other sources are only if you use !bang commands.
For example, DDG don't currently have an image search built in, so if you use !i [search criteria] then DDG will use Bing's image search.
This is quite a clever idea as it brings DDGs functionality up to par instantly without placing a dependance on other search engines for "normal" searches.
At least, that's if I understand the FAQ (http://duckduckgo.com/faq.html) correctly. It doesn't really make it all to clear how much their own crawler contributes to their index