Earlier quoted context omitted.
> Also, DDG's results compared to a year ago are night-and-day. Still looks 2nd rate. I replicated one of my last searches (learning rails): rails find if element is in array First hit on google is the stackexchange answer with .include? (which I was spacing-out on) DDG yields the Array docs, which is correct but is a helluva lot of info when I'm looking for a concise answer.
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?
Every web search engine depends on one of these indexes: google, bing, blekko, yandex, baidu.