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This is most likely that Google has more user behavior data than DDG. If enough people use DDG and click on the StackExchange link for that query (or similar queries), DDG will be able to get that to the top.

On the other hand, did DDG just use Bing API, and only Blekko crawls the web? Or do I get my search engines mixed up?



That's correct, blekko does have our own multi-billion page crawl and index. And we're private, too.

Every web search engine depends on one of these indexes: google, bing, blekko, yandex, baidu.


Don't forget Gigablast, Procog, Yioop and Samuru which also have their own crawled index.


If you think those are viable sources of results, then by all means include them.


Personally I don't, but it should be noted that there are other indexes besides what you have mentioned. That said Samuru and Procog are pretty interesting.


DDG actually uses a handful of search engines (including Bing), though I think that Yahoo! is the primary source.


Yahoo search results are already 'powered by' Bing.




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