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I'm not sure this is a great idea. Predictability is a staple of a good user experience. Getting different results for the same query between users or sessions is bound to lead to broken expectations and frustration.

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I like the idea of offering it after the first search. I see the value of this kind of search engine as introducing some novelty/entropy into the system. I could imagine using it as a backup to primary search engines, in which case I'd definitely want to get some randomness going.

I wouldn't just want the "million-and-eleventh" site (so to speak) when clicking next.

Think of this as more of a discovery engine. And predictability takes the fun out of discovery.

Great point. You might have a hard time competing with google on relevant results but you might be able to beat them on discovery, like a stumbleupon search engine.

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