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Google Critics.

Actually, Google has been very critiqued by people in all over the world.
Google is a corporation that compiles information and makes it searchable via the Internet. Google's stated mission is "to organize the world's information and make it universally accessible and useful," but this mission, and the means used to accomplish it, have raised concerns among the company's critics. The policies and practices for which Google has been criticized include its use of others' intellectual property, concerns that its compilation of data may violate people's privacy, censorship of search results, and the energy consumption of its servers. Much of the criticism of Google pertains to issues that have not yet been addressed by cyber law.

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WikiLeaks

WikiLeaks is an international organization that publishes submissions of otherwise unavailable documents from anonymous sources and leaks. Its website, launched in 2006, is run by The Sunshine Press.
I think this page is very useful and realible but sometimes the information can be dangerous.
I think that this page can make difference in the world becaus de informations of the wars, the armies...
The effect that the information can do it depends of the people but i think that it can make more harm than good.