Every wondered why some sites are taken out, and not others? Mostly, it's a case of luck and time.
http://www.seobook.com/why-google-ha...g-seems-random
Quote:
The web it too large to police and engineer time is expensive.
Policing certain segments produces unwanted blowback. How often do large corporations or influential bloggers get policed? If they edit in an incomplete or random fashion they evoke fear
It is easier to control people through fear than to create a perfect algorithm
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Good points.
I think it pays to keep in mind the processing cost of any algorithm. The cost is negligible on a small data set, but there's no way they're evaluating 100 data points across the entire data set. Too expensive, and would take far too long.
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