Search Engine Overlap and Divergence

A lot of people like to think search engines aren’t that different. They index the same internet, and they return mostly the same results, right? Not at all. A new study shows once again that search engines index mostly unique pages and rank common ones completely differently. This should carry a heavy message for optimizers, and a smaller one for searchers.
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Ask Jeeves Steps out from under Google’s Ad Umbrella

Ask Jeeves has been a faithful butler; the ads it has served up as an affiliate of Google’s sponsored listing program provided it with more than half of its revenue last year. So why is this arguably second-tier search engine striking out with its own sponsored listing program? What will Google think? And should you consider using it?
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