Social networks such as Facebook or My Space can be, at the same time, the best or the worst efficient way to advertising.

Many companies use this networks to communicate new offers, new services, and to achieve new clients. However it is dangerous because in a social network you can say your opinion about the company, a good or a bad opinion, and everybody can read it.

This is the reason why some companies contract people to control what their employees say in their blogs. Other companies consider necessary to ban their employees to write in social networks about company without authorization.

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