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The famous internet encicolpedia built by Internet users and Internet users. Wikipedia is a global and massive encyclopedia that is built and approved by certified users. Mainly due to his character and universal access often slip data and information that we entirely correct on or who have political dyes business. It is why wikipedia is considered by many as a totally unreliable means because mostly not controlled by a Committee of multidisciplinary experts. Although, on the other hand, in its essence the wikipedia is the best mirror of what is a web 2.0.