Named after the playground game duck duck goose, the site is not just banking on the support of people paranoid about GCHQ and the NSA. Its founder, Gabriel Weinberg, argues that privacy makes the web search better, not worse. Since it doesn't store your previous searches, it does not and cannot present personalized search results. That frees users from the filter bubble – the fear that, as search results are increasingly personalized, they are less likely to be presented with information that challenges their existing ideas.

It also means that DuckDuckGo is forced to keep its focus purely on search. With no stores or data to tap, it cannot become an advertising behemoth, it has no motivation to start trying to build a social network and it doesn't get anything out of scanning your emails to create a personal profile.