This thing is very difficult to say that there is certainly worthy of belief will certainly not be worthy of belief, because the promotion of this thing is generally with the rechargeable nature of the person who gives more money who can be in the forefront, that if the credit of the business can be natural promotion is also credible if the business is not good nature is injured is us. This promotion, after all, will not go to use the merchant's things and audit so this credibility is not high.