I have a feeling that many factors caused DuckDuckGo's fame, including it's Reddit challenge, spread page and just plain great surfing experience. I think that DuckDuckGo is just one of those few things that grow popular because they deserve to. In his blog,
ye.gg/blog, he explains some of these factors. I believe that DuckDuckGo's community helped quite a bit, like how it got best search engine on
about.com, where people have to vote for the winners. Of course, it's silly logo and name helped a bit, I bet. I think that becuase it is such a great search engine with such a great name, it got on the press so much. I kind of know how it is because I, myself, run a search engine. In fact it's a social search engine. It's called
Dumb Search.