"Virus " , " topic " it is sale personnel elaborate scheme produces the result that come out, when method of this kind of sale by advertisement advocate a large number of applying, transmission decreases successively with respect to meeting generation limit effect, itself also makes the one part that transmits noise. Public praise is the comment that consumer is based on product, service. It is a kind of objective existence, cannot make up, OK however " virus " the form travels quickly.
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