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The SEO’s biggest drawbacks I believe that repeated the baseless assertion, and uncertainty, a lot of the called the SEOer in website post accurate to say that it is totally irresponsible. Make a pen party, such as website value update period, some website keyword ranking enhance certain sites keyword will fall, many SEOer will be thinking of is not to do what not to do the action that websites critical word decline. In fact, the crux of the problem lies elsewhere, but may be other factors affected.