true its weird with so many filters google is installing constantly couldnt they took care of spammers. each time they do a major update so many spammers coming up at top results so many people just copying google or yahoo search results and make a page out of it and than simply redirecting traffic couldnt google just other bot than googlebot and cache these spammers
now for the good news
i did noticed google starting to clean his SERP's and good sites are slowly moving back to top pages again but it will take about 2-3 weeks more until it will finish so be calm before you decide to re optimize your sites
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