Quote:
Originally Posted by borked
No they can't... blacklisting someone could be seen as 'promoting another', which isn't allowed under FairPlay? rules n regulations. Google has denied the existence of blacklists and whitelists, categorically stating that their algo will demote sites if they are found to fall foul of Google rules, but they have denied the existence of any manual blacklist/whitelist.
They are now very much under the spotlight for this 
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But they DID essentially blacklist certain sites (or more accurately terms in an indirect way) with their instant search results. It's not quite the same thing but still it should be significant.