@Gabriel: How long do you think this will be a sustainable approach to powering Web search? What I mean is, after a certain amount of traffic will you be able to continue using all these external APIs or do you expect that in the future you will have to augment some or all of this data with something in-house like moving to full-scale Web crawls?
Thanks for that post, I didn't know Qwerly, that might come handy.<p>I wonder how DuckDuckGo decides which API to query. Gabriel, could you shed some light on this?
Gabriel, do you have any stats on proportion of zero click clicks (so probably page views where they don't click any results + clickthroughs from zeroclicks) vs use of standard search?