DuckDuckGo is a search engine that puts privacy at the forefront of their business model. Seriously, you will get ZERO search customization, because you are anonymous. But is that what people want? Are searchers happy to give up their information in exchange for extremely customized results? 

It seems to be a mixed bag. People seem to want the customization, but NOT the tracking. But what we can say for sure is that DuckDuckGo is gaining market share.