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The reason Google isn't doing the same thing as DuckDuckGo is most likely because manually banning a domain instead of improving their algorithms to avoid unwanted behaviors will only temporarily work, and only in select cases. There will always be new spam and content farm sites.

There seem to be a small number of large content farms (perhaps suggesting economies of scale are pretty important). In this case, manually killing them will work well for Herr. Weinberg.

Over at blekko, we leave in a few large but marginal sites like eHow, and let users kill them with their personal spam slashtags. For smaller spam websites, we can frequently use Adsense IDs to kill them in groups.

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