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People make web pages. Web pages link to each other. Page Rank finds out how important a page is, based on links to it from other important pages.

That idea is probably at the core of all modern Search Engines (including DDG).

Thus, all modern Search Engines (including DDG) are almost certainly based upon user activity. That being the users who build web pages and links to them.

Correct. I guess I wasn't clear. I'm talking about the personalizing of search results based upon search history, search terms, personally and in aggregate. Not based upon the structure of the web itself.

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