DuckDuckGo doesn’t keep a search history or provide personalized results through social networking connections. The company has doubled its traffic from 500,000 daily searches from December 2011 to 1 million this month. Ben Popper tells us that it sets itself apart from other search engines with a strong focus on privacy, but the one thing that sets it apart may become the most difficult hurdle to overcome in terms of gaining momentum among marketers that want to use the data to target ads.