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I'm glad they're focussing on this, because I find it generally delivers very bad results.
There is a certain contingent that holds that there is another update going on as well
[edited by: conroy at 9:56 pm (utc) on Sep 16, 2012]
If a site is returned multiple times, doesn't that immediately indicate some sort of keyword loading or over SEO?
For several years Google has used something called “host crowding,” which means that Google will show up to two results from each hostname/subdomain of a domain name. That approach works very well to show 1-2 results from a subdomain, but we did hear complaints that for some types of searches (e.g. esoteric or long-tail searches), Google could return a search page with lots of results all from one domain. In the last few weeks we changed our algorithms to make that less likely to happen
I'm just guessing here - but I'd say that when lots of pages show up from the same domain that's a sign Google's algorithm doesn't feel there are very many quality results.
I just checked today and for one of my keywords, first 15 results are from my domain. It is not something I celebrate