However, just to put DuckDuckGo's 4 Mqpd into a broader context:
Google 2013: 5.9 Gqpd Bing 2012: 3.1 Gqpd
Not to put DuckDuckGo down or anything, but it's important to understand what a >1000x difference in scale means, in terms of operating costs and scalability issues. For example, for a single person is very easy to get hold of $10k but it's extremely difficult to get $10M. (I'm not actually interested in money, it's just an example measurement unit, and particular range, that people are familiar with).
Sources: http://www.statisticbrain.com/google-searches/ http://leaderswest.com/2012/07/02/how-bings-search-increased...