I'm sorry but I have big problems with calling DDG a real search engine. Their page states "DuckDuckGo is a search engine like Google." BS. It's a meta search engine that relies on other real search engines, such as Bing, to get the results. If ever becomes a threat to Bing, they'll cut them off in a second. DDG doesn't do the hard and resource-intensive work of crawling and ranking the pages, they just tweak the results of others in ways that gets them publicity on tech blogs.