In some cases you have professionals do the review and in some other cases you will have the average person write it up.Review sites have a number of ways in which they can gain revenue for themselves in the form of advertising.In some cases，a business can pay his way through to a better listing spot.This does not mean that a positive review will be promoted where it is not warranted(担保)．

　　Review sites are largely a public forum and it is not necessary for people to reveal their identity.Since people are anonymous(匿名的)and sign up access is open to all，there are chances that reviews will be planted or will be negatively written simply to discredit a particular product or service.

　　There is a lot of criticism towards these websites since they do nothing to control the kind of entries or the source of these entries.On the other hand，there are professional review sites.These people are accountable for each of their reviews.Any doubts you have will be addressed personally by the one writing the review.Such sites work on much better principles allowing for a fair opinion.

　　Considering they have a better reputation，they are aware of some of the latest products that are released worldwide.This gives you a better chance of finding reviews of the latest product.While a review site will help you narrow down your choice，it by no means should influence your final decision.That is based entirely on the way you see fit.

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