hey rise of scandals because of orkut.com?

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nowadays a increasing number of so call social networking sites are on the rise and to all surprise some people are using it a means to defame others by making fake identities and thus let them fall in trouble yesterday onle i heard cases of people having their id taken by someone and then adding their friend in their friend list and then sending them foul messages . is it correct then what must be done to overcome this sort of problem.