Bing is the most heavily poisoned search engine, study says:
"Bing search results are more affected by poisoning than those of other search
engines, according to a study by SophosLabs.
Search engine poisoning attacks are designed to skew results so that dodgy sites -
anything from malware infected websites to payday loan sites - appear prominently
in the index of sites related to popular search terms. In many cases the tactic is so
successful that malware sites appear in the first page of results for popular search
terms, in sometimes much higher than legitimate websites. More recently,
miscreants have began trying to manipulate image search results."
See:
http://www.theregister.co.uk/2012/10...rch_poisoning/