assange wikileaks

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friends as all u know that today one of the burning topic is "wikileaks" my question is how far it is correct to reveal all that cofidential matter to the world???? for many people he is hero....... and for some one he is terror....... upto todays data that he revealed quite good and which world should know but what about future... if he reveals the data which is confedential for any nation what will happen??? what is your opinion about this???